I don't think it would, both should be better. Not sure about RM4, Xpression sounds good even with included cheap cartridge. You will probably want to add speed controler if you go with Pro-ject - definite improvement. Rega is good too and very popular.
I've used and still own, both the Oracle Delphi and Sota Vacuum Saphire tables. Neither is as musical or 'right' as the Planar 2. I replaced the original motor with the Rega Upgrade and am using the SRM platter. The Michell Technoarm w/Denon 103D completes the package. Highly recommended.