The spec sheets list the Malibu Response LXi 2008 as cut diamond and the Malibu Response TXi 2012 as modified vee, so check how each hull rides in the conditions you use before you decide.
On paper these two are close siblings in the size department - Malibu Response LXi 2008 at 20,0 ft versus Malibu Response TXi 2012 at 20,5 ft. At 2 800 lbs and 2 900 lbs respectively, both sit in a similar weight class - either should pair comfortably with most mid-size SUVs and half-ton trucks, though always confirm your specific tow rating with the motor added.
The Malibu Response LXi 2008 carries a rated maximum of 400 hp. Engine data for the Malibu Response TXi 2012 wasn't available in our records - check the manufacturer's spec sheet before sizing a motor.Both carry nearly identical fuel loads - 41 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 Malibu Response TXi 2012 is rated for 9 passengers, while the Malibu Response LXi 2008 caps at 8. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Malibu Response TXi 2012 could be the deciding factor.
Bottom line: Choose the Malibu Response TXi 2012 if your priority is putting more people on the water - it handles 9 passengers and at 20,5 ft it has the deck room to back that rating up comfortably. The Malibu Response LXi 2008 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 8 that costs less to run day-to-day.