yeh tesselation in sketchup would indeed be useful. my pipeline is still sketchup (from clients/architects) > 3ds max (via the new Connection Extension) > Render. works well but subs in sketchup would be very useful! thankfully sub-ds in max work well enough. they're even better in XSI (just press + or -!)
I've been leaning towards using more 3Ds max lately because my render plugins are pretty flakey when used with sketchup. I love sketchup and it's the reason why I find max so clunky and unintuitive.
While it's clunky though, I find subdivision extremely useful as well as max's superior ability to handle far larger amounts of geometry, though I suspect that's down to Sketchup using OpenGL.