When comparing Dungeon Defenders II vs Bloons TD Battles, the Slant community recommends Bloons TD Battles for most people. In the question“What are the best PC Tower Defense games?” Bloons TD Battles is ranked 26th while Dungeon Defenders II is ranked 31st. The most important reason people chose Bloons TD Battles is:
One of the make or break aspects of tower defenses is whether there's anyone to play with, and Bloons TD Battles has that in spades. There are very few times where you have to wait more than 30 seconds for a battle, even when it's a mode that almost everyone has forgotten about.
Specs
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Pros
Pro Visual appeal
Charming characters, vibrant colors, and an art style that is cohesive across all their content.
Pro Free to play
You have access to all levels and difficulties and the 4 starting heros. New heros can either be bought or unlocked by earning defender medals through mission completion and daily quests.
There are hero costumes which can't be earned in game but they are purely visual. The only advantage a paying player can buy is more bag space or extra hero card slots (you get +1 card slot when you unlock a hero with in game currency but can buy more if you want duplicates).
Pro Constantly being improved
There are updates nearly weekly and always new levels and characters being added. The more recent Incursions have also been more of a challenge compared to some of the original content.
Pro Lots of players make queue times short
One of the make or break aspects of tower defenses is whether there's anyone to play with, and Bloons TD Battles has that in spades. There are very few times where you have to wait more than 30 seconds for a battle, even when it's a mode that almost everyone has forgotten about.
Pro Multiplayer
Unlike most tower defense games, this game is full on multiplayer. They have a unique system of economy that incentives sending enemies, but you also have to know when to store up resources for defense, or big rushes.
Pro Updated often
Bloons TD Battles is updated fairly often, and has had new game modes come out every couple of months. They adapt to what people like and dislike, and base updates partly on that, while adding ideas of their own.
Cons
Con Everything that was wrong with Dungeon Defenders 1, is also wrong in this version
Bad gear balancing, pay 2 win gear, 1 builder 3 dps, many hackers/cheaters.
Con Still in development (as of 8/25/16)
Each patch often brings as many bugs or balance problems as it does bits of additional content. They are usually worked out but it might turn away players looking for a finished product.
Con No challenge until the highest difficulty
There is a campaign mode but it's far too easy even for brand new players. And after you're done with the campaign, your fastest method of leveling to cap is running the same boss repeatedly on a low difficulty. Why have 8 difficulty levels if you encourage your players to skip half of them through poor balance?