need actual setup (gear, buffs, consumables, etc) to compare damage yield for different stats;
you can actually calculate damage with just the info from irowiki (formulas, ATK, refine bonus, maxSP) using your setup for parameters;
ATK and mHP for TC/FC - these two parameters are essentially equal in terms of contribution (1 HP vs 1 ATK)
ATK and mSP for GF - most setups usually involve a larger proportion of gears contributing to mSP (due to the reality that mSP is easier to increase with a variety of gears; initial base mSP value is much higher pointwise - while ATK often hits the realistic maximum value earlier); you can optimize and determine whether STR or INT is better provided you can think of a limiting value (a potential total of ATK + mSP, with the real limit being which tier of gears one can afford) - (a rough example, last post page 1)
though honestly, trying to balance stats is basically a case of jack of all trades, master of none;
would personally suggest to not worry about gfist too much, and just focus on TC/FC for the meantime;
Edited by ka10, 30 March 2015 - 03:30 PM.