I use a 650 and have always used a fishing net/deep glove. My issue with my Nokona now is it popping off the heel.
Based on what you're currently using & your description of your abilities, my answer to you would be
NEITHER!
The Nokona AMG650 is a 13" glove that plays big. It's more like a 13.5" glove, if anything. Both the RCV-L & JD73-L are going to be significantly smaller in comparision. Not sure why you think that going smaller is going to help you any.
In any case, balls popping off the heel is not the glove's fault.
A much better option for you would be the following:
- BMB - One of its variations. It will play smaller than your 650.
- BV55 - My recommendation. It'll play close to your 650.
- EI1918-22 - Less expensive verion of the BV55
- BMBS-22 - Less expensive BMB pattern.
- RV60 - Great glove that'll play slightly smaller than your 650.
- TJ1952 - Will play a little bigger than your 650.
In fact, now that I've listed these & thought about it further, the BV55 is like a no brainer choice! Especially when you consider that Vinci is right now closing out a previously $229 glove for $139!!! You just can't beat the quality & the price. In fact, I might just pick up another one myself!