What really matters is comorbidities associated with being fat.
If your liver is fine, if you don't have advancing diabetes to a point where you take insulin, have some type of heart condition, etc., I don't see the urgency to get an RNY done. Even with me I had 3 surgeons (my surgeon in particular who, after speaking to many people who work with him, noted he LOVES the RNY) all convince me to go sleeve mainly because my liver fibrosis stage 3 and diabetes (which are definitely a big health risk) were very much under control and quickly improving.
Post-op the VSG gives you more freedom without the RNY side-effects, plus the inherent risk to both the RNY surgery, which is greater than VSG, and the risk/complications later on if you require any major surgery in that area, should always be taken into consideration. People in the private industry who push certain surgeries may be doing so for their own benefit and not yours.
If your surgeon recommends bypass get a list of why and possibly get a second opinion. If it's based on general assumptions rather than your personal conditions (if any) then it's doubtful that's much of a necessity. Bypass is supposed to be for people with more serious issues necessitating the increased risk of complications. That's why for people aged 50+ I see it's very much more often RNY.
Keep in mind too that any good surgeon will offer a follow-up on a VSG so that in the case it doesn't work out as planned an RNY is still an option. This is the case with me.. am offered RNY after 1 year if I don't like the way the VSG is going.