The Stratos 170 FS 2006 vs Stratos 201 XL Evolution 2011 comparison sits squarely in the category of decisions where specs alone won't tell the whole story — intended use, storage, and long-term ownership costs all factor in.
The power gap is worth calling out. Rated to 250 hp, the Stratos 201 XL Evolution 2011 has a 135-hp advantage over the Stratos 170 FS 2006's 115-hp ceiling — enough to notice on acceleration and at cruising speed, particularly with a full passenger load. Fuel capacity breaks the other way: the Stratos 170 FS 2006 carries 26 gallons versus 5 gallons in the Stratos 201 XL Evolution 2011. On a lake day that's negligible, but for coastal cruising or long reservoir runs the extra range matters.
For family outings this is probably the sharpest distinction between the two. The Stratos 201 XL Evolution 2011 is rated for 6 passengers, while the Stratos 170 FS 2006 caps at 5. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Stratos 201 XL Evolution 2011 could be the deciding factor.
Bottom line: Choose the Stratos 201 XL Evolution 2011 if your priority is putting more people on the water — it handles 6 passengers and at 20,7 ft it has the deck room to back that rating up comfortably. The Stratos 170 FS 2006 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 5 that costs less to run day-to-day.