I wouldn’t be so hasty in selling your EB101. A good service and it would still be competitive with a Rega P3 - in some ways maybe preferable.
I'm sorry, but I just can't agree.
On the face of it the plinth and suspension seem to make it superior but it's not, just different, and it's not the best suspension system in the world. The real issue is that the suspension separates the motor and suspended platter. Even on the LP12 this causes speed stability issues and the Linn has a much heavier platter. The sub-platter and platter on the AR are lightweight aluminium.
The motor on the AR was less good than the motors on the original LP12 and Regas. Current Regas use a new low voltage motor that is a big step up and allows plug-in upgrade to a fairly sophisticated off-board electronic power supply.
The bearing on the AR is ok but of course was not made yesterday. If it has play it won't sound as good as it once did. Rega have been tightening up their bearing spec for decades so a new, or very young Rega will have a better bearing.
There just isn't any contest on the arms. The Rega one is so much better it's not funny so no, an old AR turntable will not be competitive to a current Planar3. No shame to it, still a nice record player for a few hundred quid. Still very enjoyable in isolation but play it against a new Rega and it'll take you about five seconds to realise which is the better deck. The Rega will be tighter, more dynamic, more informative and just plain better in every way.