Having 2 tablets, i did a test last night.

For Poser and for Blender, the mouse won hands down. There was no competition al all.
What I mostly missed on the tablet pencil in Blender was the mouse "middle button" and the "rotating wheel".
The tablet pensils did not have those, and this slowed work down to a crowl.

For texturing work, (Gimp) it was about even. The tablets won on pressure sensitive usability. the mouse won for controllability.

For pure painting work, and photo touch up? The tablets won hands down.

hope this helps

Poser 1, 2, 3, 4, 5, 7, P8 and PPro2010, P9 and PP2012, P10 and PP2014 Game Dev
"Do not drive faster then your angel can fly"!