What's your favorite system how weapon weight is handled?
A short explanation of the given choices:
build
The build stats affects the attack speed of each unit. It's a gainable stat. It mainly depends on the gender and class. Men and tanky classes like brigands have higher base build and growth than females, but scrolls can fix this issue.
constitution
Constitution is a fixed stat which only can be increased by a class change. As for build it mainly depends on the gender and class. Men and tanky classes can use heavier weapons than fragile classes in the entire game.
strength
A similar system to build, only that strength is the buffer here. In the Tellius games it only really matters in early game. After a while the units have the required strength to use all the weapons without speed penalty. However mages will have issues to use heavier tomes. Especially bad in FE11 since magic users don't have a strength growth.
fixed (de)buff
In FE14 some weapons give you a speed boost / penalty. For example javelins give you -5 speed. It goes for all.
no buffer
The weapon weight will be reduced from the speed, so negative speed is a thing here.