I'm not sure about the 10" option: it would need a bigger motor ideally, because of the increased radius, so if it has one, fine. It depends what you do: it's argually better to stick with 8" to start with then to go for a different, bigger-table, bigger saw at a later date when you really know what you're after. The 8" one should be just as accurate as te 10" the only real difference is 1" more depth of cut (theoretically) and possibly slightly less torque on the 10" one (check the motor rating).
I have the Kity sliding table (I have both a Kity 419 and an old-style TS200 - many common parts). The Axy sliding table used to be identical. I don't know if Axy changed the detail when they updated the design of the saw recently, so take that into account.
The sliding table is nice to use for cross cutting and trimming panels. It's a right pain to set up accurately, and if you need to take it off, for example to move the saw, you have to align it all over again*.
But... it's too small for large pieces of sheet material (they are NOT proper panel saws!). It's too short for large pieces of sheet material (Kity used to do a 3m track option for their version for that reason). It needs a lot more space than just the saw, but it's space you need anyway for doing the cuts -- the difference is that it gets in the way when you're NOT using the saw.
I think, on balance, I'd probably find an outfeed table more useful for single-handed use than the sliding table. With an assistant looking after the outfeed, the sliding table is brilliant tho, and, as I said, for cross-cutting rails to length (using the stop on the fence).
One design flaw is that the accuracy depends on nylon-tyred rollers underneath the sliding table. I've had tyres split on these (to a C-shape, making them bump as they go along the track like a train going over joints in rails), Axminster carry spares and they're not expensive, but it is annoying. You also have to adjust the tightness when you replace them, and it's hard to know when they're just tight enough -- mine may have failed because a previous owner overtightened them. The hold-down clamp is pretty rubbish too, but that's no big deal.
On balance, I like having it available, and I think Axminster's package deal is good value. Bear in mind though that the stand designed to go with the saw doesn't have a very wide base. If you're going to cut really heavy or wide panels, AND if you're going to use that stand, you might think about bracing it to the left. I've never had mine tip, but it will if I lean on it (mine is on a roughly made trolley arrangement rather than that sort of stand, and not bolted down presently).
I do have the same stand under my planer/thicknesser though, and it is easy to tip up (I use roller stands with the p/t - you might find those ball-roller ones would be good for sheet stock on the saw, and unlike a p/t, the height will stay constant).
Can't make up your mind for you, but you could get a nice router for the difference in price if you omit the slide and make your own stand... just sayin'.
E.
The height adjustment is/should be a one-time operation, but you'll need to check parallelism each time you put the track back. That said, you could make a jig fairly easily to do this very quickly.