I have shot both. Bought the EP5. Used that scope at Rifles Only rimfire class on a Vudoo V22. Took the rifle out to 400 yards in a 20 mph crosswind.
My only issue is the zero stop has malfunctioned twice. Maybe something I did in the setup since it is a little different and I don't have a lot of zero stop experience. The eyebox/eye relief is a little bit short-tight compared to some other scopes I have, but nothing dramatic.
IMO, definitely worth the upgrade over the SH4