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Both mounts have the same capacity so it's a matter of whether the change over is worth it to you for the gains. The AP break-apart head is great and makes it very manageable. The counterweights slide on rather than screwing. The hand controller looks bulky but is in fact very well-designed and has great inbuilt routines for finding objects, exploring constellations as well as controlling the mount functions. It has a complete list of star proper names as well as bayer designations, which is great. Another feature not available on many mounts is the ability to image up to at least 2 hours past the meridian with a "meridian delay" feature which puts the counterweight shaft temporarily into the upside down position. Very useful if you want a continuous imaging run without a meridian flip.
you need to be aware that the 1200 has recently been replaced by a 1600 mount with substantially greater capacity and price. This may mean we'll see 1200s on the used market. The 900 will have similar treatment in future. If you want to steer away from computer use then the current models may suit you better.
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