When two boats share the same hull type — in this case both the Malibu Response LXi 2005 and the Malibu VLX 2010 are modified vee designs with composite 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?
The power gap is worth calling out. Rated to 505 hp, the Malibu VLX 2010 has a 105-hp advantage over the Malibu Response LXi 2005's 400-hp ceiling — enough to notice on acceleration and at cruising speed, particularly with a full passenger load. Fuel capacity breaks the other way: the Malibu VLX 2010 carries 46 gallons versus 41 gallons in the Malibu Response LXi 2005. 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 Malibu VLX 2010 is rated for 11 passengers, while the Malibu Response LXi 2005 caps at 8. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Malibu VLX 2010 could be the deciding factor.
Bottom line: Choose the Malibu VLX 2010 if your priority is putting more people on the water — it handles 11 passengers and at 21,5 ft it has the deck room to back that rating up comfortably. The Malibu Response LXi 2005 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 8 that costs less to run day-to-day.