Both the Sea-Doo Switch Cruise 18 - 230 hp Tech 2027 and the Sea-Doo Switch Sport 21 - 300 hp Tech 2027 are tri-hull designs, both built in polytec, 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?
The power gap is worth calling out. Rated to 300 hp, the Sea-Doo Switch Sport 21 - 300 hp Tech 2027 has a 70-hp advantage over the Sea-Doo Switch Cruise 18 - 230 hp Tech 2027's 230-hp ceiling - enough to notice on acceleration and at cruising speed, particularly with a full passenger load. Both carry nearly identical fuel loads - 47 gal and 47 gal - so range won't be a tiebreaker here.
For family outings this is probably the sharpest distinction between the two. The Sea-Doo Switch Sport 21 - 300 hp Tech 2027 is rated for 10 passengers, while the Sea-Doo Switch Cruise 18 - 230 hp Tech 2027 caps at 8. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Sea-Doo Switch Sport 21 - 300 hp Tech 2027 could be the deciding factor.
Bottom line: Choose the Sea-Doo Switch Sport 21 - 300 hp Tech 2027 if your priority is putting more people on the water - it handles 10 passengers and at 20,4 ft it has the deck room to back that rating up comfortably. The Sea-Doo Switch Cruise 18 - 230 hp Tech 2027 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 8 that costs less to run day-to-day.