ua, you don't mention what your tool of choice is for polishing. Rotary?
Flex? PC? Are you only concerned with this specific vehicle or multiple vehicles going forward?
I can tell you that since I picked up my orange pads I rarely reach for my yellows. But, when you need a yellow and time is of the essence, then that's the pad you need. Yeah, you're going to have to follow that pad up to get the finish right but it can still save you time, and I usually follow up my orange pad as well.
If you think you need (or want) a yellow pad, buy one. You sure can't use what you don't have and you'll never know if you like them or not.