I am not sure if which is best rom posts are allowed.
However to quickly answer your questions I am on jelly bean stock rom rooted and look at my antutu score in signature.
ps - I kid you not that score is definitely visible when using the phone it flies along without any lag others will disagree with this.
As always YMMV.
Best of luck.
1x LG G2 D802T 16GB White 36591 Antutu 4 score (jelly bean stock rom - rooted/shows unrooted in download mode
1x LG Optimus G E975
1x Goophone I5 n2
1x Thunderbird 4s
2xHTC Touch HD2 T8585(Taiwan/China)
1xSamsung Galaxy S I-9000(Korea)