I’ve built both PCB and all point to point kits. For me, the decision is not about sonics but about ease of construction and upgradability. PCBs are much harder to solder and much easier to screw up than the lugs of a point to point build. If you want to upgrade down the line, any parts on the PCB are also going to be way harder to unsolder and replace.
Like Ralph, I prefer more power even with my very efficient Zu Druids, but lots of people love the SET sound regardless of speaker choice. You would do well to try to borrow one or more to see how you like it before investing in a kit. If you buy a kit before listening and end up not liking it, the resale value of kits is pretty dismal, not to mention all the time it took to build it.
As far as value vs. pre-made, these days I prefer to listen to music rather than build kits. It’s all I can do to drag out the tube tester to make sure everything is operating at spec.