OK, given the constraints "world cruising, HR (46 I presume) and Hylas
(also 46, 45, 44?) and Swan (not sure which one, but since you mentioned you sailed one when you were younger, it's the older vintage S&S 44,) and I presume unlimited budget
. Well the Hylas and Hallberg are both Frers designs, fairly similar I believe. I probably shouldn't chime in because I haven't set foot on either of those. Both have good reputations though. I bet you'll get equal votes for both. The Swan being older will probably not be the better choice, of the 3. I hate to say that 'cause I lusted after those when I was a kid too. Are you hunting for the "world's best world cruiser at 45 feet?" Let the games begin!
OK, edit: after a little research
I am betting the HR will win out, being the heavier of the 2 and specifically having a more world cruising displacement
to length ratio than the Hylas.