I knitted the English method for a few years and then thought I'd try knitting Conti.
It took a little while but I can knit Conti if it's something circular like a baby hat but the Conti purl I found awkward.
Anyway, I thought I'd try knitting a small cardigan using Conti Knit and English Purl. I don't like the result at all - the surface looks uneven on the right side.
If you go to my post lower down - Purl Pick-Up with Pix - you'll see a photo of a button band. Look closely at the knitting to the right of it, it's very uneven.
Serves me right for trying to get the easiest of both worlds!
I think it's a good idea though, to try and learn to knit both ways, you're using different sets of muscles, instead of just the same movement over and over again and not changing at all.
All the Best