As for angle of the strings going over the saddles my friend Felix likes to crank the tailpiece as low as feasible to increase sustain and the transfer of string vibrations to the body. (With some bridges if you lower the tailpiece too much the strings will hit the body of the bridge. Ouch!)
One other issue: the total length of the string from tailpiece to tuner affects the "feel" when bending notes. I like regular wraparound bridges because it is more responsive to your bends. Compare the E string on a strat to the E string on a LP... that's why the strat feels so sluggish to me when bending the E or B strings. (The longer length does allow your bends to be more accurate pitch-wise which can be important to guitar n00bies.)
I was looking into that recently because some of the used guitars at GC are strung up that way which my friend says is WRONG! DEAD WRONG! Well, the threads I found suggest that it changes the "feel" when bending, making it more sluggish (in my terms) but still a matter of taste.One will sometimes see recommendations for solid-body guitars that use a bridge and tailpiece to string "backwards". That is, the strings are fit through the holes in the tailpiece, facing the end of the guitar,, with the strings wrapped around the top of the tailpiece, heading towards the bridge. The idea, as I understand it, is to reduce the angle that the strings make from tailpiece to saddle, ostensibly improving acoustic sustain.
I don't see how a "lazy" angle over the saddles would increase sustain — a sharper angle increases the force of the bridge pressing against the body. My friend will do that on strats, too, by adding a shim in the neck pocket closest to the neck pickup which allows him to raise the saddles.
BTW before the introduction of the tune-o-matic bridge some Gibsons used the tailpiece as a bridge so the strings went in backwards, wraparound style. I think that they only did that on solid body electrics since they already had great wooden bridges on their acoustics assuming that you used the string gauges they were designed for.
Acoustics are different because you want the tailpiece secured to the sides at the bottom strap button so it doesn't affect the vibrations of the top. As to the length from the bridge to the string ends I have no idea what would be best.