I use a 6' Landpride rear finish mower.
I have also used my neighbors Rhino 6' rear discharge finish mower.
In my opinion, the 7' mower would be too big.
The 6' is perfect.
Especially if you have any hills or inclines to climb. And besides, the 7' mower is more expensive than a 6'.
just my 0.02 worth.
dwight