A lot of JY's famous fight scenes are not 1:1. Let's toss those out of this discussion. This is all about 1:1.
Which is the best 1:1 fight JY ever conceived?
Some contenders are:
LOCH: OYF vs H7G at Huang Yaoshi's island
ROCH: YG vs GWM at the end
YG vs ZBT
H7Q vs OYF again
DGSD: Xuzhu vs JMZ
Tianshan Tonglao vs Li Qiushui
HSDS: ZWJ vs Kongxing
SPW: LHC vs Chongxu
Fangzheng vs RWX
ZLC vs RWX
LHC vs RWX