The Triton Boats 177 Explorer 2010 is a deep-V design and the Triton Boats 192 Allure 2009 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.
The power gap is worth calling out. Rated to 175 hp, the Triton Boats 192 Allure 2009 has a 85-hp advantage over the Triton Boats 177 Explorer 2010's 90-hp ceiling - enough to notice on acceleration and at cruising speed, particularly with a full passenger load. Both carry nearly identical fuel loads - 37 gal and 40 gal - so range won't be a tiebreaker here.
For family outings this is probably the sharpest distinction between the two. The Triton Boats 177 Explorer 2010 is rated for 650 passengers, while the Triton Boats 192 Allure 2009 caps at 5. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Triton Boats 177 Explorer 2010 could be the deciding factor.
Bottom line: Choose the Triton Boats 177 Explorer 2010 if your priority is putting more people on the water - it handles 650 passengers and at 17,6 ft it has the deck room to back that rating up comfortably. The Triton Boats 192 Allure 2009 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 5 that costs less to run day-to-day.