When two boats share the same hull type — in this case both the Achilles RV-140 2008 and the Achilles RV-156SB 2008 are inflatable non rigid designs with inflatable construction — 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 — Achilles RV-140 2008 at 14,0 ft versus Achilles RV-156SB 2008 at 15,0 ft. Weight tells a clearer story for trailering families: the Achilles RV-156SB 2008 tips the scales at 185 lbs — 170 lbs less than the Achilles RV-140 2008 at 15 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 Achilles RV-156SB 2008 is rated for 12 passengers, while the Achilles RV-140 2008 caps at 9. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Achilles RV-156SB 2008 could be the deciding factor.
Bottom line: Choose the Achilles RV-156SB 2008 if your priority is putting more people on the water — it handles 12 passengers and at 15,0 ft it has the deck room to back that rating up comfortably. The Achilles RV-140 2008 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 9 that costs less to run day-to-day.