Yes, the flight time is very clearly meant to get really close to that 2290 studio rack gear tone, whereas the future factory is similar but closer to like a DIG or something like that (just imo, of course)
They are both really good, but the flight time is just by far the closest I've been able to find at nailing that 2290 "studio 80s metal lead" type sound
As far as delays go, in my experience it very much depends on the sound that you're going for - the boss is great from what I understand, if what you're really after is the EVH tone. It does that in spades. That isn't really my jam, specifically, so i'm not the best person to ask about it, although I've played them a half dozen times. It also has a bunch of routing, wet dry, etc options that are killer.
But for me, by far and away the most important thing is the core sound of the effect itself, and that's why I vastly prefer the flight time - it just completely nails the 2290 thing, on an even higher level than the TC pedal version
Honestly we're at a point in history when we are spoiled for choice with pedal options, and i feel lucky that there's something out there that gets as close to a racked 2290 as possible without actually having to cart a rack around (again) - that sound IS my lead sound, at least with my band, and every drawback it has is just dwarfed by how good its core tone is.