In my opinion, you should start your decision process looking for a provider that has done a significant number of procedures and work from there, irregardless of which filler you select. For my own penis, location and cost were low on my list of factors. I was willing to wait however long to go where I felt I had the best chance of getting the best outcome.
Personally, from what I've read over time, I would tend to feel that
Bellafill isn't likely the best
PMMA variant for this specific purpose. Although I would assume that in the hands of an experienced person and with the right aftercare, if you have no issues with the carrier, you could likely still get good results. Also come to terms with spending some real time scouring here and the web, and set your expectations at a realistic level should you decide to do something, and be patient after. Try to get in touch with other patients as well from where ever you go. Ask pointed questions and if you don't get answers you're comfortable with, move on.