The advantage of tga is the alpha channel (which is irrelevant for 2D games.) The disadvantage is large file size since it is not compressed.
Note that PNG also supports alpha transparency but is a pain to work with and that feature is poorly supported in tools like Photoshop. In general, if you need alpha transparency your best bet is to use TGA while working and save final versions as PNG for use in your game.
Note that PNG also supports alpha transparency but is a pain to work with and that feature is poorly supported in tools like Photoshop. In general, if you need alpha transparency your best bet is to use TGA while working and save final versions as PNG for use in your game.