RL calipers are Aisin units, whereas 3G TL-S (and all 6spd TLs) have 2-piston Brembos.
Not sure anyones been able to really to a fair side-by-side comparison of the two units. But they both improve braking tremendously.
Vimal, your plans look good! Best of luck. And I don't think too many Honda 17's will clear either. Obviously the TL-S waffles will. And the 18" TL A-specs. The 17" RSX's won't, IIRC.