I concur with
@Dr_Tsay regarding the higher odds (and propensity) of uncircumcised men yielding less-than-satisfactory results.
In my time following this scene both on the front end (forums) and on the back end (private messages, emails, and discussions with physicians), the sample size is overwhelming when it comes to the fact that uncut (a.k.a. uncircumcised) men have a higher chance of aesthetic irregularity compared to those who are circumcised. That said, uncut men have and still can have successful outcomes, but they run the risk of not only less-than-stellar results, but an even more challenging correction/revision path in subsequent appointments.
In fact, some Clinics won't offer filler injections to uncut men, while others require a waiver to be signed before proceeding. I'm not trying to be a downer to those who are adamantly opposed to circumcision, but this reality ought to be laid out to any & all uncut men who are considering this methodology (i.e. injectable phalloplasty) as their primary means of girth enhancement. I appreciate Dr. Tsay's candidness in this regard, a testament to his experience with dealing with a variety of patients.
It's really a decision of "Adult Circumcision + Recovery + Dermal Filler Injections" or "Remain uncircumcised and chance it with a quality injector." Dr. Tsay's reviews online are overwhelmingly positive with respect to his aptitude in injectable cosmetic procedures, and even he clearly has reservations. So do with that information what you will. I should also note that Dr. Tsay (like all medical professionals who post here) are limited in the amount of information they can provide without a direct consultation, so it wouldn't hurt to see him in person if you're in SoCal, it provides the Practitioner much better context before drawing any further conclusions.