I have lots of the Moyou London plates. They're ALL fab but I suppose in the end it's all down to what you & your clients like and want. My most popular ones are Princess plate 14, Kitty plate 12 & Sailor plate 7. I've just bought Bridal plate 7 as it's gorgeous for lace designs and I use loads of different plates from their Festive Plate collection throughout the year.
I'm a stamping plate addict so I have to restrict my plate buying! I now tend to buy with particular clients in mind so I know the plate will be used - I bought an Explorer plate (23) as I know one of my clients loves giraffes, a Fashionista plate (01) as I have several clients who love sewing etc, one of the Rockstar plates for clients who love music. All my Moyou London plates stamp beautifully.
I also have some Konad circular plates that have smaller designs which some clients prefer, these also stamp well. I have some of the other Moyou circular plates but I don't find these as easy to stamp from.
The Real Mrs Grey has fabulous YouTube videos on stamping and plate reviews (Search Sarah R) and I've bought a few plates having seen them on these videos and loved them.
I'll try and upload some pics of my favourites for you later on.