Top mounts provide a lot less piping, particularly with the 09+ turbo layout. The intercooler is practically integrated into the intake manifold. Shorter piping means less air for the turbo to move before it starts increasing air volume in the compression chamber. Particularly if you have no plans of upgrading your turbo a front mount is a poor choice. Personally, I would stick with a top mount for even a moderate sized turbo upgrade. Only the largest turbo upgrages, ones requiring a rotated setup anyway, would I recommend a FMIC for. TMIC's have many advantages, the main disadvantages are that they have to be removed to work on the engine beneath them, they are more exposed to waste heat from the engine (heat wrap the headers, turbo, dp, etc to help this), and they have more limitations on intercooler volume. In return, you get much much shorter piping, fewer rock chips, and more space to work with for intakes, radiators, headers, etc. And they're a lot cheaper and easier to install.
2015 STi: Still Stock
04 STi, 04 WRX: SOLD