Most Trace heads will run into 4ohms lowest.
(AH500 does 4ohms into each channel biamped)
Most Trace cabs are 8ohm to allow multiples.
there are a couple of exceptions: 4 or 8ohm verisons of the 2x15, 8x10 is 4ohm
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Sounds huge and meaty through the 4ohm 2x15. Which I can do if you want one.
The full size 1x15 with the 4x10 on top (with or without horn) is classic, if a bit of a lug.
4x10s are the choice for slap/bip. One is almost always enough. (I can do with or without HF tweeter).
You can put it through the compact cabs (I can do a 1x15 and 2x10 with tweeter).
Punchier, if less room fill.
In my book, the big cabs are worth the carry.
Any side-by-side will prove their merit.