The Fish-Rite Fishmaster 20 ft. 2008 is a flat-bottom design and the Fish-Rite Rogue 18 ft. 2007 is a modified-V design, so you're likely deciding between two noticeably different on-water experiences. Hull type shapes everything from ride quality and fuel burn to dock handling and resale trajectory.
On paper these two are close siblings in the size department - Fish-Rite Fishmaster 20 ft. 2008 at 20,0 ft versus Fish-Rite Rogue 18 ft. 2007 at 18,0 ft. At 750 lbs and 850 lbs respectively, both sit in a similar weight class - either should pair comfortably with most mid-size SUVs and half-ton trucks, though always confirm your specific tow rating with the motor added.
The power gap is worth calling out. Rated to 200 hp, the Fish-Rite Fishmaster 20 ft. 2008 has a 25-hp advantage over the Fish-Rite Rogue 18 ft. 2007's 175-hp ceiling - enough to notice on acceleration and at cruising speed, particularly with a full passenger load.
For family outings this is probably the sharpest distinction between the two. The Fish-Rite Fishmaster 20 ft. 2008 is rated for 6 passengers, while the Fish-Rite Rogue 18 ft. 2007 caps at 5. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Fish-Rite Fishmaster 20 ft. 2008 could be the deciding factor.
Bottom line: Choose the Fish-Rite Fishmaster 20 ft. 2008 if your priority is putting more people on the water - it handles 6 passengers and at 20,0 ft it has the deck room to back that rating up comfortably. The Fish-Rite Rogue 18 ft. 2007 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 5 that costs less to run day-to-day.