Go for the M3 OEM offset ones, you won't regret it. For the ARB, standard rubber oem ones are the best already. RTABs - get the standard ones, but there is an improved design type somewhere that has metal sleeves for quicker replacement.
If you stick with M3 oem offset rubber instead of poly, the ride NVH quality will feel the same, although the bush may wear out quicker because there is "less rubber" on one side of the bush. Just remember to get a good 4-wheel alignment done, including caster.
This is the reason I went for poly on my e36, in fact my car already had oem offset rubber from factory but I went poly despite the harshness to get even more caster and in fact, an extra 5-10mm extra wheelbase (used Powerflex bushes, front wheels pushed forwards slightly).
Longevity wise, during movement the oem rubber ones rub against the round metal end of the lower control arm so they need to be greased often to last longer... whereas on a poly there are two halves on each end, they rub against each other and contain tiny "pockets" that will hold grease between them.
Handling wise, I felt the difference immediately. I'm really particular about wheel/suspension geometry and steering response so the handling felt noticeably improved in every way especially around high speed bends and during quick direction changes (less understeery) except for a slightly heavier feel and a slight background noise on rougher roads (as though your window has a gap somewhere but there isn't!).
But I have to say, unless you drive the car hard (or track it) and have upgraded suspension to match, there is not much point because the E36 has a very slow steering rack ratio so most that little improvement is lost under regular driving.
Hope this was useful
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