I would say the 10" Dob is better on two fronts.

1. More aperature = brighter views at the eyepiece, better limiting
magnitude, and greater resolution.

2. Wider field. The Dob is at f/4.5 or f/5, for a focal length of 45"
or 50". The Mak is focal length f/15 which is 75" of focal length. The
wider field will make looking for galaxies and fitting large open
clusters in the FOV alot easier.

Just my $.02