I’ll be using the Dexcom CGM which is approve to wear to 7 days before switching. The pump you change every 3 days. Its better than 14 shots a week. And pumping will be so much easier for me.
Great debate! I’ve been on both a few times and can say that both do have these advantages and disadvantages. Unfortuately for me, I have more disadvantages on the pump. The ultimate control would be to do the untethered regime and be on both but thats a little unrealistic. I am one of the few who only need one shot of Levemir a day and having 31 gauge needles also makes it pretty easy. Like others have said the only disadvantage from MDI is not being able to change the basal rate during times of excercise. I was on a CGM for awhile but my body gets taken over by infusion sets and having another needle in me speeds up the process besides the CGM was always slow, so I could never see how much better it was than a meter.
I didn’t gain weight when I transitioned to the pump. I’ve been able to keep my weight pretty steady (+/- 3 lbs.) since I started. However, when I started MDI, I did gain weight. Leave it to me to get it backwards. 
Good list. For me, the advantages of the pump far outweigh the disadvantages. In addition to temp basals for exercise, dynamic basals for the dawn phenomenon, and microdosing, I love square wave boluses. They make bolusing for protein and high fiber meals so much simpler. I also love EZ-bolusing when discretion is desired.
If I didn’t have a need for any of those features then I probably wouldn’t be on the pump. I’ve largely gotten used to being tethered to it almost 24/7, but I’d be lying if I said that I wouldn’t prefer to be untethered. I think that the omnipod and smaller tubeless pumps in the future will gradually decrease this issue though.
I was also backwards. I lost about 35 lbs on the pump a few years ago, most of it I had gained on MDI.
Agree w/ the basal adjustments on the pump. I went from R/N (incl IV R shots when I was in a hurry…caution, do not try this at home…) and, during my training session, the endo mentioned that N had only a 53% chance of peaking when it was supposed to! I know that Lantus/ Levimir are not nearly that crazy but I also don’t think that they are nearly as controllable as a pump? I think that MDI+ CGM would be better b/c you could get the data about peaks and durations but part of me thinks that you’d discover that it was more irregular than you thought? The basal flexibility (less if you are active and more if you are sick/ stressed or whatever…) is totally amazing for me. I exercise a lot and, when I switched from running to biking for a couple of months over the summer, I could tell that I got ‘more bang’ out of biking than running, which suprised me, b/c I thought running > biking in terms of BG impact, etc.? This kind of diminished after a while and I could make much finer adjustments to basal dosages to keep from running out of gas than I think I could w/ shots.
Re weight gain, I was about 275 at my peak, winter 2005. I realized that was a bad combo and started exercising more, eating less and taking less insulin. W/ the R/N, it was a bit ugly and my A1C went up but I did lose weight (by up, I mean 7.2/7.7, not whizzing the weight away or anything like that…but still…) and kept exercising. I think I was 225-235 or so by the time I got the pump (April 08) so it was very slow but I kept at it and am around 190-195 these days, although I’ve been there for a while. MrsAcidRock has suggested that if I laid off the potato chips and beer, it would probably help but well, ya know?
It's mostly a personal choice issue. Omnipod has it's own issues as well. Go with whatever works for you.
Pumps theoretically give much better basal/bolus control, but sites apparently are less efficient (for lack of a better word) on day 3+ compared to day 1. MDI is very consistent with dosing. Additionally, I don't worry about a pump/tubing/cannula malfunction. The syringe works.
Then there is the cost issue. Pumps are expensive, I live in on the coast, near the beach, and carrying around a $5,000 piece of electronic equipment is generally a bad idea here.
Then I don't mind the MDI 'problems' and I have a system that works for me. I preload a couple of syringes with Apidra and put them in with by BG meter, and that all fits in my pocket. I don't have a problem with the 2 levemir injections a day, don't mind syringes (some people really do), and I'm okay if I have to inject in public.
I also have a CGM which I generally love.
I loved the information and ability to fine tune with a pump, but I found it involved a lot more gear and I didn't find the dosing of insulin as consistent. I was using the Omnipod and maybe a different pump would have worked better for me, but the beach thing is a deal breaker.
One other thought...pumps also tell you the amount of insulin on board, and can give a bolus over an extended period of time. I also agree about exercise. If you go all out for a few hours, you want to be able to turn off basal.