Oh I like Pokemon deeply, but in terms of monster-collecting genre, I just prefer the SMT/Devil Summoner games. Just for my preference, really.
Let's take movepools for example: In SMT, you can have more than 4 moves in a Demon, and Demons can have vastly different moves, depending on how they're fused and raised. In Pokemon they only have 4 moves to choose from, in which there's not much room to choose from vastly different others other than the ones they learn via TMs/HMs/Move Tutors/Level Up (ie. Pikachu can never learn Hydro Pump). In SMT, basically anything goes in terms of movepools. There are some exceptions sure, like signature moves, but even those can be learned for different through accidental fusion.
Like Pokemon though, Different species of Demons also have different base stats to work with. But it's easy to work around - you can use a variety of licenses to strengthen up your demons, or from Devil Summoner, you can use certain demons to raise stats. You can raise stats in Pokemon too with the different supplements. The thing is, there's not a "fixed stat" in SMT - for example, in SMT Nocturne, your stats can only increase to max 40 for each stat. So if you want to, you can raise your favourite demons to that stat, and they won't lose in power compared to other demons that only come in higher levels.
SMT produces more mature plot lines than Pokemon too, which again is simply in my preference; you're a young teen who enters an apocalyptic world, with Demons all over the place. People are violent, they make cults, and do other screwed up things. Demons again are everywhere, eating misfortune humans or weaker demons who come across their path. It's a dangerous world, but you're in this world to try and tackle the challenges ahead of you, in order to reshape the world to your choosing. In Pokemon, it's the same formula sure; you collect badges, fight against bad guys, in order to become the Champion in your region. That said though, there's nothing wrong with a set formula as long as it's done well, and I think Pokemon still does it well, with few twists here and there!
Now, I still do enjoy Pokemon, but my own wish is that Pokemon will have more customizable options. But you can also argue; it doesn't need it, and it has the features where everyone can play. That's where SMT sort of drops the ball at; it's simply not for everyone, and the learning curve can get immense. </3