Well, at the risk of having a bunch of DAGS posts, left or right tilt seems to be get left tilt if you're right handed. A left tilt saw, as I understand it, lete waste from bevel cuts fall away from the underside of the blade with the fence on the right side of the cut. If the waste is on top, you risk throwback of the offcut. Also, narrow bevel cuts are supposed to be safer. I am sure others will add their remarks.
Fence seems to be a matter of personal preference. Do you like green or blue or yellow? - pick one - there is no "wrong" answer. Some folks say that the face of the Bies units isn't flat, but two saws that I use have them and they work fine. As for UNI vs General, I think that general gets a nod for quality at a slightly higher cost. I asked for feedback on the General 350 a few days ago and the feedback was that the General was a better saw, but parts may or may not be a problem as it is mfg in Canada. My understanding is that the internals of the saw are heavier and that the arbor pulleys have an extra bearing for support - so the saw is more in the league of the PM66. General also has a left tilt cabinet saw.
The "old" uni's and the "new" X5s are the same saw, both US made. The Delta dealer near me said that in 2004 production of the X5 saws was going to Chiwan, so if you want an American made saw, today, Delta and Powermatic are it. If I can find a General for a good price, I'll be on it like white on rice. Not to clutter things, but the Jet cabinet saw on amazon comes with a router, lift, long table and a hell of a good price with favorable reviews and is also a strong contender.
I think I have this information right and I hope this helps - I'm looking for a saw too... If'n I made any mcsnakes, I'm sure someone will set me straight.
John Moorhead Lakeport, CA