TWD is definitely the harder of the bunch. Horde wizard mode is very attainable and very fun at first but sometimes I feel like man, horde again? Now I can't progress to go for LMS, terminus, or siege unless I timeout the mode which is just not my style. very fun mode nonetheless, but does become tiresome at times. TWD does offer a lot of depth and breadth and is both frustrating yet exhilarating. The fun factor on twd is hit or miss for me; I typically don't have that feeling to keep pressing Start because it takes a long ball time game to open up the board so after an hour session of pinball, there's a good chance you didn't get much done achievement wise. Good game if you want a challenge with both a frustrating and rewarding path to opening up other aspects of the game, and have a lot of time on your hands as that's what it'll take to finally get that great rush of a game in.
SM is the easiest of the 3 with fun and challenging attainable wizard modes. The wizard modes on SM is the best part of SM. The villain modes and call outs are very repetitious but lighting spider arrows makes up for it. If you want an easier marathon with
repetitious yet fun style game, go SM.
GOT PRO is fantastic. It's still has some code issues that need refining but the meat is all there and it's goo-ood! It offers fast fast gameplay with all attainable, fun, and challenging wizard modes. Hand of the king is a blast mixing up different houses to change the ruleset of the wizard mode; and doing the bonus round can be an absolute blast. Winter has come wizard mode lacks sound effects and call outs for making shots in its current code state but its rules more than make up for it. Iron throne is another diverse style wizard mode with lots of creativity. All 3 modes are attainable with unique and fun rulesets which keep you pressing start over and over and over agai.....and over again. And the beauty is it doesn't take a marathon game to get through it all and everytime I press start feel like I have a chance to open them all up and explore a new experience each time.
Overall, i give a heavy nod to GOT PRO. Then TWD. And SM last.
As for TWD pro vs premium. You're only missing out on walker bombs. Everything else is great on the pro. Walker bombs helps push those marathon games to see LMS and siege all which are very difficult to achieve. But horde and terminus will always be there for both pro and premium models. Oh, there's also crossbow frenzy which both models have but I imagine the actual crossbow on the prem is more fun than the pro.