then there's something wrong with your buddy's LSV - there are several reasons i believe mastercraft is a better built boat but malibu builds a fine boat too - disparaging comments like that are either a result of poor maintenance by the owner or exaggeration.
X15 is a discontinued hull, and MC didnt exactly nail the 2012 electronic systems.
I've ridden behind a slammed 04 LSV with a big block. Wake was bananas, i believe the hull has been updated since then and i imagine is only better.
One consideration is how rough can the water get where you normally boat? the lsv will have a much hasher rough water ride.