Right. The reason the Monk is superior in Hand-to-Hand Melee Criticals is because he/she is the Martial Arts expert. Obviously, the Martial Arts skill improves bare-handed performance. Without this skill, a Fighter would be just as effective with bare-hands as the Ninja and Monk.
The 25% ,always applied, bonus means that point for point in Martial Arts, the Monk will always be better.
Again, this is only when fighting bare-handed.
The Ninja has more choices in weapons, both melee and thrown, than the Monk.
A Z-Bo for the Monk makes up for some of this but a Faerie Ninja with a CoC blows it away.
Then again, a Monk with the Z-Bo is more versatile than a Faerie Ninja equiped with the CoC.
With a CoC equiped, the Faerie Ninja has only 2 attack options.
Short range melee and magic. You can "remove curse" during combat but who wants to waste turns just to equip another weapon?
The Z-Bo is not cursed so all attack options are open to the Monk
IMO though, if both are taken to their ultimate peak, the Ninja is the better of the 2. Similar skills but the Ninja has more weapons to choose from and is a magic caster that can't be silenced.
Spence