I typically just say "voicebank," or "UTAU," myself. I actually don't have an issue with the use of "UTAUloid." To me, "UTAUloid" is just one more word to describe what someone's talking about. (Also, the idea using "UTAU" for everything automatically makes me think "Marklar," but that's me.)
Also... I don't get the "omgnoob" cringe-factor response other people seem to have to the term. To be honest, the fact that there is an admitted cringe response kind of... well, makes me cringe. Especially since it's mostly attributed to newcomers. I doubt I need to remind anyone, but it's hard enough joining an established community when you're still learning the ins and outs, without having people roll their eyes at you for not knowing the exact right word or phrase they prefer to hear when making yourself understood. To me, that response rings of an almost "good enough to belong" feeling that I don't really like. As far as I'm aware, this forum has generally been above that sort of attitude when it comes to new users.
TLDR; I think both terms are acceptable, and I wouldn't look down on any user (new or otherwise) who uses it. There's been enough drama in the community as there is without dragging cliquish high school cafeteria BS into it.
Of course, that's just me. -shrug-