Both the Tige R20 2011 and the Tige Z1 2010 are modified-V designs, both built in fibreglass, so the buying decision usually comes down to a handful of practical questions: how many people are you putting on the water, how far do you trailer, and what does your tow vehicle weigh?
On paper these two are close siblings in the size department - Tige R20 2011 at 20,0 ft versus Tige Z1 2010 at 21,0 ft. Weight tells a clearer story for trailering families: the Tige Z1 2010 tips the scales at 3 714 lbs - 225 lbs less than the Tige R20 2011 at 3 489 lbs. That difference is meaningful if you're working within a half-ton or three-quarter-ton truck's tow rating, especially once you factor in a motor, gear, and fuel.
For family outings this is probably the sharpest distinction between the two. The Tige Z1 2010 is rated for 11 passengers, while the Tige R20 2011 caps at 6. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Tige Z1 2010 could be the deciding factor.
Bottom line: Choose the Tige Z1 2010 if your priority is putting more people on the water - it handles 11 passengers and at 21,0 ft it has the deck room to back that rating up comfortably. The Tige R20 2011 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 6 that costs less to run day-to-day.