really parasitic capacitances sizes or values in your design are not very important when your load or compensation capasitor is high; that is, when you achieve a safe phase margin for you specific application (low or high accuracy) this means that your nondominant poles(zeros) is high enough according to your gain-bandwidth product.
however, when use small load cap to reach higher speeds, then your parasitic caps must be small enough; thus choosing not very large aspect ratios (W/L) for minimum channel lengths of transistors (otherwise if required) is needed, but your gain of your amplifier may be lower significantly;
however there is a trade-off between them!
Regards,
SAZ