First, I fully understand the difference in the two, and that they both serve a different purpose, and they compliment each other.
My question is, if you only had budget for one of them right now, which would you buy first? I have a pm60 jointer for squaring up, and have been doing a lot more segmented turning. The drum sander would really help getting good segmented rings after the ring glue up prior to the stack glue up. But if the wood I start with isn't consistent in the beginning then the drum sander is going to take forever if at all.
I think my inner battle is that i always need to sand the rings, regardless of how consistent the wood thickness I start with which makes me lean toward the drum sander first.
I found a Delta 31-260x for $350. I've been looking for a used planer in that budget range.
So, planer or drum sander first?