Is Graham Slee Revelation best affordable all around phono pre?

Yes, a crowded market for sure which leaves me unable to decide.  I've been deliberating for months over which MM-only sub-$1000 phono pre to buy for a second system running an early 80s AR ES-1 and Grado Prestige Gold cart.  I do keep coming back to Graham Slee (e.g Era Gold MK V ). Hmmmm…..

Yes, there are many phono pre amps out there but when you are looking for one with mulitple EQ settings it really narrows the field.  You might look at the Gold Note PH-10.  Personally, I use a separate phono pre for 78s and earlier mono recordings.

Do you just change out the cables or have some kind of a/b switch?

I change the cables.  With my Technics turntable it only takes about 5 minutes to move the cables and switch out the cartridge.