I use a 24ft facelift carbon for day to day pole but I've just took on a office to clean I need at least 30ft pole to clean it I was going to buy 2sections for my facelift but was thinking of getting a new pole anyway was going to remove sections from the 35slx for my everyday pole.
Can't comment on the Xline poles, never used them. But I would recommend either the 25-SLX and buy the extension kit upto 35' (you can always buy the next set up too if you get a bigger job) or if you have joint ache, getting older than 35 or have enough money, get the Ultimate or Xtreme.
I've had an Xtreme 25 for a few years, mainly domestic work though, and it's been excellent. Light, not as bendy as the SLX and quite robust (although some on here will disagree with this last comment). I got the extension packs upto 44' while they were on offer, which are easy to put on quickly when required. Even easier to put on /off if you have the Exceed Univalve tubeless set-up.