I would recommend the higher HP since you might be working in hard wood at higher speeds and don't want to bog down (burn the wood) or run out of power. In addition, the more complex your cutting tools, the more power you would like to have.

Depending on the cuts you are making, similar to a metal machine lathe, I would also recommend several passes rather than trying to remove too much stock in one pass. I have watched wonderfully dangerous explosions happen both with metal and wood lathes, and it gets pretty ugly and dangerous. Metal working tends to function slower with more power, but you will need to balance spinning a leg at the right speed (or not) with the speed of the router. Double action (spinning a leg while routing a design at the same time requires some coordination of speed (spinning RPMs) and travel (length travel with the router).

Nice machine!