Pulling you onto this thread if I may, so as not to derail the other thread entirely!
Must admit I'm not a big user of amp sims on any of the multis I've had thus far, which is why I've got the Helix HX, which doesn't have amp and cab sims, rather than the Stomp which does and, in any event, I'd be of limited use in saying how good e.g. the TE amp sim is given that I've not been a TE amp user / fanboy to date! But maybe one of the other B1(X)-4 or B3N users on this thread can jump in and say if they rate the Zoom amp sims. I suspect they won't be as close or as realistic as the ones on the Helix Stomp - I know that @dave_bass5 has both pedals.
As a fyi - the amp sims on the Zoom include: Ampeg SVT, Ampeg B-15N, Fender Bassman 100, SWR SM-400, Aguilar DB750, TE AH400SMX, Markbass MINIMARK 802, EBS HD360.
PS it does seem like the Zoom B1X-4 is the spiritual successor to your Zoom BFX-708 which I think came out a decade ago and is now described as a 'rare vintage guitar pedal' on eBay!