Dota 2 is regularly patched and changed with new characters being introduced and balance changes made. This can prevent the game from becoming too stale as the tactics utilized by players changes often.
SMITE, by far, has the best graphics and art style in the scene, the map design is great, Hi-Rez studios tries their best to keep the gods as mythological lore-like as possible, and the cosmetic skins crushes the other cosmetic skins in other MOBAs. They have these what they call Tier 5 skins, li...
The developer of Strife purposefully set out to create a MOBA that is less toxic than what is currently on offer, they have implemented blocked chat across teams as well as limited chat on ones own team, making for less communication between people who at times will be having heated moments.
The developers of AirMech show a great bit of inspiration in AirMech that is derived from the 90s classic Herzog Zwei. Something of a spiritual succesor if you will that is now reformed into the current trends of MOBAs.
All of the in game options means there is a swath of strategies to experiment and play around with making for a game that one can spend a good amount of time playing in order to learn all the different aspects.