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I wish I'd bought track not circular.. that said I've got a lot more adept at being precise with the circular in the time I've owned it, even without a track. (I haven't done anything requiring super super precision.) Have contemplated a (universal?) track but never been fussed to figure out combatibility.
Given the cost of materials if you're doing anything significant the cost of a track saw gets eaten up fairly quickly.
Evolution have been pretty good IME, not for heavy trade use, got a regular 240v corded circular saw for cutting pallets and general rough work. They use an odd size of blade so don't expect to get one cheap or easily. But the stock blade is decent enough, lots of teeth good for reasonably decent work, tracks nice.
Would defo budget for two blades over whatever comes with whatever you choose. 1 with less teeth for rough work and just getting it done, and one with much small fine teeth for when your cutting finished/visible edges.
Proper track saw is a beautiful thing, but honestly for most DIYer an average circular saw with a £20-40 blade in good condition and a bit of experience and you'll be happy.