I played them both at MGC multiple times. Here is my take. First, for me BK3 premium smokes the pro. You are going to want that upper playfield. I ragged on the animations after the stream, but they look better in person. Still seem less polished then JJP and Alice Cooper, but not bad like Houdini. The BK3 gameplay was pretty much what you would expect from Ritchie. It is fast, loud, and blinds you with flashers. I really didn't find the black knight mech that great. The flail just kinda gets in the way. The knight himself just seems like they stuck a doll in the middle. But I did enjoy the multiball action and was one shot away from the 6 ball! My verdict: great for location but not so much at home. For me, if I want a fast and brutal Ritchie game I would get an older one. That's why I have bought Tomcat twice and now it's bolted.
Wonka: it plays and flows and feels like Dialed In to me. Very smooth with lots going in. Tough to figure out right away. When I first played DI, I didn't like it. Just felt off and I really didn't get the shots. I hit them, but just didn't feel rewarded by hitting them. But over the years and more and more plays at shows, I've grown to really enjoy it. I think Wonka may be the same. After all the reviews, I was disappointed. It just felt like another good game. Verdict: I would sit it out and am considering a used Dialed In.
So, bottom line: both are good but more of the same. If you love Ritchie and modern Sterns then you will enjoy BK3. If you love Lawlor and JJP you'll love Wonka. If you are on the fence play before you buy. Me, I'm now home playing my Alice Cooper and loving it. I've got my Tomcat and SW if I want speed and blinding lights. I've got WOZ, Hobbit, and JJPOTC if I want a longer more immersive game. But, for my wallet, little Spooky really made a unique game with ACNC. So, the little guy beat the giants for my dollar.