I'm about to start working on my next serious project, but before I get too deep into it, I'd like some advice on what development tool to select.
The game will be a 2d tactical RPG, targeting the PC. The biggest technical challenges are likely to be the AI and online multiplayer (turn-based, thankfully).
I'm very experienced with Game Maker, so I'm strongly considering making it in GM Studio. I know GM will be able to handle most aspects of the project, but I'm not sure how well GM handles multiplayer. I know multiplayer GM games exist, but I don't have any experience making one myself. Also, GM Studio was only just released, so it's still unproven.
Unity should certainly be able to handle the project, but the engine isn't intended for 2d games. Using Unity for a 2d project could be more difficult than it is worth. Also, I haven't ever completed a game with Unity. Unity is also more expensive at $1500, but I can use the free version just fine unless I make $100000.
I can of course create my own engine. However, I have never done this before, so this option might be too risky.
I'm sure there are other options, too...
Any advice you can give me would be useful.