I started with a 12x5 years ago. Switched to 14x4.5 about a year in and that's become my go to size ever since. (sometimes 14x5) I've tried 16x5 from time to time but the 2 extra inches didn't really seem to help much and tends to get in the way more than anything because you still have to go around pipes, outlets, switches etc. If I had miles of open wall with only a few obstructions I'd still pull out the 16, I still carry it in my bag, but the gain is marginal imo and the 14 seems to hit the sweet spot of size and maneuverability at least for interior. For stucco (aka render) a 16 might make more sense but I doubt you're saving time with it. Use it if it's more comfortable for you.