In terms of servicing the quickest and easiest is the following order (easiest first) LV1, Geo, DM then Luxe. None of them ever gave me major issues but I always cleaned down after every game and lubed and checked for leaks the night before playing. Luxe has leaked the most with the DM behind but was always just an oring and a quick fix the night before then worked fine on game day so if your prepared to put the effort in they are fine. Geo never leaked and swapped the orings after a year and had zero issue. LV1 not old enough to comment (only a few cases through).
Although the luxe power core takes longer to service than the others the tool less eye covers save some time when your cleaning everything down at the end of the day as the eclipse eye covers require Allen keys so you get some time back then. The DM has an eye pipe which can crack and graze if the barrel is over tightened but does cover the eyes themselves. People either love or hate the eye pipe approach, never really bothered me and worked ok on my markers but I put on oring on the barrel to help me from over tightening it.
LV1 used only with Oil but used the Luxe with Sleek and Monkey Poo without issue. Used Dye Lube, eclipse grease and Hater sauce on the DM and Geo and I personally preferred the Hater Sauce.
Luxe has a manifold screw too soften bolt return and the Feather touch screw to soften the forward motion to handle brittle paint. The Geo has an adjustment to smooth out the shot (on the grip frame) and the LV1 has two adjustments for forward and backward stroke (similar to Luxe). The DM makes use of an LPR which you can adjust to soften the shot. As with anything, it is possible to adjust settings on all of these markers and proper screw up the shot quality and efficiency so if tinkering isn't your thing then you'll be pleased to know they all shot fine on stock settings to me. Luxe has rechargeable battery and the others take 9V.
Hope that helps