The AB-Inflatables Alumina 16 ALX 2015 vs AB-Inflatables Oceanus 21 VST 2017 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.
Size is the most obvious dividing line here. The AB-Inflatables Oceanus 21 VST 2017 measures 21,4 feet overall (2017), giving it roughly 5,4 additional feet of deck space compared to the AB-Inflatables Alumina 16 ALX 2015 at 16,0 feet (2015). Weight tells a clearer story for trailering families: the AB-Inflatables Oceanus 21 VST 2017 tips the scales at 1 808 lbs - 1 274 lbs less than the AB-Inflatables Alumina 16 ALX 2015 at 534 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.
The power gap is worth calling out. Rated to 150 hp, the AB-Inflatables Oceanus 21 VST 2017 has a 100-hp advantage over the AB-Inflatables Alumina 16 ALX 2015's 50-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 AB-Inflatables Oceanus 21 VST 2017 is rated for 6 passengers, while the AB-Inflatables Alumina 16 ALX 2015 caps at 4. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the AB-Inflatables Oceanus 21 VST 2017 could be the deciding factor.
Bottom line: Choose the AB-Inflatables Oceanus 21 VST 2017 if your priority is putting more people on the water - it handles 6 passengers and at 21,4 ft it has the deck room to back that rating up comfortably. The AB-Inflatables Alumina 16 ALX 2015 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 4 that costs less to run day-to-day.