Rega P3 vs RP3

I have an RP1 and am thinking of upgrading to the RP3. But there are some tempting deals on the P3. Thought about one vs the other? Thanks in advance.
I have a P1 and have upgraded to the rega glass platter. It did lower the noise floor. then I tried a herbies way excellent turntable mat and it really lowered the noise floor even further. I did away with the standard MM cartridge and went with a Denon DL-160. Very satisfied with the sound. I thought about upgrading to a P3 as well, but the combination I have in my opinion is very good. only way it would get better is getting a vpi aries.