[Wavytone]

Ok...

Sky-Tee - had one, sold it. Good for 2 scopes side-by-side e.g. 4" refractors, but a 250mm Newt will be pushing the friendship too far. Simple bush bearings with friction. No slow motions and clutches are effective but crude. No encoders so a push-to setup is not possible.

Discmount DM4/DM6 - A lot better than a SkyTee. The DM4 is inadequate for what you want but a DM6 will easily take a 130mm refractor, C11 or 250mm f/6 Newt just fine. And encoders are available. Side-by-side not possible, and no drives or manual slow motions. Huge oversize bush bearings with friction. Low-res encoders (6k steps) are a factory fitted option, not possible afterwards.

Losmandy AZ8 - as Glen suggested its the benchmark to compare the rest. It's a lot stiffer than a SkyTee, and it has axes that run very free in ball races plus worm drives (both axes) and superb clutches that do what they should. The downside is that if not properly adjusted the worms will be loose and chatter, or too stiff, so you'd better be reasonably mechanically aware and have a set of allen-keys handy. High resolution encoders (311,000 steps/rev) are available from Astro Devices.

AYO mounts - like the SkyTee, with encoders built in (factory fitted) which means you're stuck with low-res ones.

NOTE: With all of these mounts a lot depends on the tripod underneath.

With a SkyTee, the usual Skywatcher tripod is quite simply inadequate and you will need to step up to a surveyors tripod (head to Bunnings).

For the Dismount DM4/DM6 or AYO the tripod is up to you; importing one from DiscMounts is costly; alternatives are a Berlebach Planet or GeOptik Hercules, either will cost well north of $1k.

For the AZ8 Losmandy can supply their LW tripod, its a pretty good one and a bargain.

However.. a Wild-Heerbrugge military theodolite tripod is both stiffer than all the above, and taller (1.8m) which is useful if you have a refractor. look for these on eBay, they do come up occasionally.

FWIW I currently have an AZ8 on a Wild-Heerbrugge tripod and am adding the encoders and a Nexus II (for a push-to setup) and considering motorising it.