Then why compare it to other games with which it appears to have little in common? It certainly doesn't LOOK like it's in the same genre as all the other titles.
Elemental Monster is most definitely a TD title. It just adds in a very cool card element to use as your defenders. I can't speak to the other title, I haven't played it. But if you like TD, then I can't imagine you wouldn't like EM.
Defender chronicles by far. Mostly because of the great devs!! Then fieldrunners( just wish that subatomic studios would update it once in a while)
Rather than "best" TD, the one I enjoy the most are Sentinel 2, Elemental Monsters, and 7 Cities. Which is ironic, because none of those are on the poll.
so far I got 5 Td games on my phone. EM is my first TD game I like it a lot , the card system make it stand out from other td games. But the replay valu is low, after I finished it, I don't even wanna play again. DC is another td diff from the others it mix role play sys make it very addicted. plus replay Val is high, every updated from the dev will surprise me. DC got my vote easily