There are pros and cons with each surgery. It's true that you lose slower and less weight with the sleeve, and dumping is not much of an issue. If you follow the prescribed way of eating, dumping shouldn't be a problem with the bypass, either.
One of the most important things with the sleeve, is that I absorb the nutrients from the food I eat. This is not true with the bypass. Also, my bowels stayed intact. I was prediabetic, and have great A1C test results now. Also, I had high blood pressure, and have been off of those meds since shortly after surgery.
The best thing you can do, is talk with your surgeon and your nutritionist then decide which avenue you want to take. Regardless, please keep posting and let us know how you're doing.