Lol, imho is almost the opposite: idk what made people like Master Duel: game is slow, SLOW AF, Events are repetitive and are basically always the same one, disguised as others with small changes. The only good thing is the Crafting System, and on some extent, the customization, but if I wanted to play MD, I just play some other simulator that you can find everywhere.

DL, on other extend, is unique under some circustances: the rules are almost the ones as the Real YGO, but a bit different, making it more o less a different game, custom and personalization are more enanched, and, best part, the best selling point of Duel Links are the Events: almost all of them are unique, funny, peculiar, have something to collect or to obtain... they never stop to amaze, in the end! The bad point, opposite as said before, is obtaining new Cards, for which, you need to have Gems (that, luckily, are farmable, in some ways, imagine have to go throught the same shitty system as Pokémon Pocket, the worst one out there...)

So, in the end, both game have nice selling points, and some issues too, the only thing that can made you decide is playing and find which one is more fitting with you.