I have a multiplayer fps game I want to make, and wondering if I should stick with Unity 3D, or move to a different engine. The game I have in mind is very similar to battlefield. The main concern I have is I want to be able to support at least 64 player matches. There will be alot of people using vehicles and planes so the maps will be large. I want the maps to be wide open with no fog.

I've read that the Torque engine could handle 100 or even over 125 players. Although the graphics of the games made with Torque dont look that appealing. And wondering if that would spell trouble for my game.

I have no networking experience so I will be learning that along the way. Although I want the easiest platform to work with and the most suitable engine for my game.

Unity uses the Raknet library for its networking implementation and you can also use the .Net sockets and write your own or use an existing one. A lot of people use Photon server with Unity when they want larger amounts of players and/or dedicated servers. Realistically you could do everything you want regarding networking with Unity you just have to build the implementation. Also note that supporting a large amount of players isn't really about which library/engine you use but about your implementation and how much data you are sending, etc.

Also note that aesthetics and graphics are completely separate topics that usually get lumped into the same thing by newcomers. It is impossible to judge an engine by looking at screenshots, etc because you are comparing the aesthetics of the art and not the technology itself. There are many capable engines for indies (in my opinion Unity and C4 are the two best) and performance and how it looks will be determined by your art team and programmers, not the engine itself.

thanks for the response. I'm researching Photon right now and also considering ulink. I heard that Unities built in networking is not very good. Or at least needs a ton of networking skills to do correctly.

I've been a 3d Artist for 5 years so I know that graphics and performance are two different things. Although I like to look at the graphics of engines so I know that people are able to do detailed work and the program is not technically limiting their capabilities.