the b650e-e has 2 gen5 pcie slots, f has 1 gen5, e has 4 nvme slots(2 can be gen 5 but you'd share lanes if you used 2nd), f has 3, 1 is gen 5, 1 gen4. e vrm is 16x70A, the f is a 12+2 80A if my memory is correct(I'll have to double check that)...you get the q code display on the e, not on the f, and rear you get 1 usc gen2x2 port(type c)7 usb 3.2 gen 2 ports(1 usc c), 4 usb 2.0 ports...the f get 4 3.2 gen 2 portsr 3 are 3.2 gen 1...both use ALC4080 sound codec...both boards are manufactured on a 8 layer pcb
so little differnewences that add up, for the £40 more
the gigabyte board the 2 pcie slots are 1 gen4, 1 gen3..you get 3 m.2 nvme slots, i gen 5, other 2 gen4(so same as gaming f)..rear i/o you get 1 3.2 gen2x2 type c, 2 gen3.2 gen2 and 4 usb 2.0 ports on back...vrms are 12x60A..it uses alc897 sound codec which is quite old..manufacturered on a 6 layer pcb
there is no right or wrong..the strix are better specced but if you wont use any of the bits, or don't care, the gigabyte board is just fine too...there are no real bad boards...except maybe some of the cheap asus prime b650 boards which i would avoid..if you like the look of the gigabye board and suits your build, go for it
I was just reading thread and you wanted as much future proffing as you can get, so only pointing out...whether any of it is needed is a different discussion, I jiust remember a whole load of people chopping in their b450 boards for b550 when they got 3090 gpus as they didn't want to loose the 1~3% diff that the b450 pcie3 boards would loose to the pcie4 boards of the b550...gessing if you're dropping £1400 on a gpu, you want all the performance you can get...
Think the 4080 supers will sell...from reading reviews etc, that's the gpu most people have been asking about.don't think they'll sell out immediately so think as long as you're looking on release day, you'll get a card..oif it is close halfway between the current 4080 and 4090 in performance, the price to performance will blow the 4090 out the water