I don't see why "they're effectively the same, but I chose X and have been using it for Z years now, and I'm widely considered an expert" would be any different

I don't see why "they're effectively the same, but I chose X and have been using it for Z years now, and I'm widely considered an expert" would be any different from...I don't know, denying that they're the same. If anything, denying it would be evidence of ignorance, no?