We strongly considered the Vegas before purchasing an ACE 29.3. For us the deciding factors for the 29.3 were:
A little more room
What we gave up for the Ace:
Smaller footprint, easier to maneuver.
Some more money
Happy with the 29.3, but would probably have been happy with the Vegas as well. How you plan to use the RV may be the most important factor in deciding which would be best for you.
1998 Min Winnie, 2000 Winbago Journey, 2015 ACE 29.3
2016 Thor Miramar 34.2