Sword Saga vs Tartaros Rebirth
Sword Saga
Sword Saga is a pretty different, browser-based MMORPG from R2 Games. This game puts you in the shoes of a mercenary leader who is embroiled in a great war over the very valuable and powerful Starmoon Shards which you are charged to collect so as to put a stop to the impending demon invasion. Although Sword Saga feels like every other web-based MMORPGs that you might have played before, this game has a lot more strategic depth to than you might expect that is only revealed later on in the game.Sword Saga is also a game that's really easy to get into, and it has plenty of events and things to do to keep you engaged throughout the first few hours of the game. It may not be an innovative game but it manages to do all of the things you want/ would expect from a browser MMO game very well.
Tartaros Rebirth
Tartaros Rebirth is the revived version of the anime-themed MMORPG that was popular back in the 2000s, Tartaros Online. Featuring everything you know and love from back in the day, this game has something new to offer as well, such as brand-new storylines. Like the original, you'll get to play as one of nine unique characters, each with their own personalities and skillsets. You can switch between them while you're in town, but not in dungeons or instances. Questing is the main way to level up in this game and the grind is real. However, there are tons of places for you to explore and you can even use higher level characters to complete quests for your lower level characters to turn in.The combat system is rather clunky though, so is its controls with keys that you'll probably have to rebind. Battles are played out in a semi-action-based manner, but since you can't really dodge, block or dash away from danger, all the "non-action" can be a bit underwhelming. Not to mention, the graphics isn't updated somehow and although it may have been acceptable back then, it is definitely not something that will appeal to players in this day and age.
So, in short, Tartaros Rebirth is a great anime-themed game to play, despite sharing many similarities with Dragon Nest, for nostalgic purposes but if you're simply looking for a new anime game to play, you might have a better time playing Lineage II: Revolution.