I wouldn't know about the resale difference between the two,
Since you have a 10" rough and flushometer style, the easiest for the plumber would be the same type replacement. No plumbing is required for this.
It's just bolt in and out.
If you go with the Gerber with tank, the plumber will need to get into the wall and move the water supply.
Either way, you will be moving 1.5 to 1.6 gallons of water.