On the riving knife thing:
I've had kickback twice on my Makita. In both cases I was being very, VERY stupid in the way I was using it:
- Wedged into a relatively tiny space in the attic, cutting t+g chipboard for flooring - nowhere to stand safely, let alone use saw and rail - the saw twisted during the cut, because it wasn't set-up nor being used safely.
- Trying to rip cut an already too thin piece of softwood that wasn't properly supported on the bench, had gnarly grain, and IIRC wasn't using a rip blade and was trying to go too fast.
I can't emphasize enough that I was being very stupid.
I do have a thin-kerf rip blade for the saw, but, because the saw plate is very thin, the teeth re-cut the rubber strip, which is wholly undesirable. I think the blade can also deflect slightly in use, which is dangerous. It's a cheap, third party one, and I won't use it again.
I don't make tables from huge slabs of stock (well, not at the moment!). If I rip anything, it'll be relatively narrow stock, and the track saw (
any make of track saw) is unsuitable for that task. Of course you might make a jig or whatever, but it's not what they're designed to do.
With that as a given, I don't think there's much to choose between Makita and Festool, apart from a couple of things that might be important, depending on how they're being used:
- There is an anti-tip system for Makita that's designed into saw+rail. I've used it for long bevelling cuts, and I like it - coupled with workpiece clamps, it makes the job safe and easy.
- There are different (and more) accessories for Festool saw and rails, notably a splinter guard for the "waste" side of the stock, and stops for the rails to allow plunge cuts to be made to precise length without risk of cutting too far.
Both brands have router accessory sleds that run on their rails.
On dust extraction: there's no magic about this. They all do it very well because the blade guards are almost blind (small apertures allowing blade change) and fit right down to the surface of the stock (almost). Any saw with this approach will be very good when cutting into a flat surface (e.g. cutting up sheet goods), as it puts the suction in the right place and going in the right direction. If you trim cut so that the blade is running off the edge of the stock, it makes a right old mess, as the extraction suction doesn't work at all well: This is also true of all brands. I'd expect the Mafell to be even better, incidentally, as it's blade guard is completely blind. At a guess you can rank them on DX just by looking at photographs of them!
Which to get? The Makita is British-made. It's less expensive, although the price gap is a lot less now than when I got mine. The Festool has excellent after-sales support.
I couldn't choose easily now, but the riving knife issue is a red herring: the important thing is not to try to use any of these saw systems outside the designed limits.