I would say flat bottoms are of higher probability of being in the money than declining bottoms... TA books will almost always show you flat bottoms as examples. That's just me. This also makes perfect sense too, think about it if you have declining bottoms that means the resistance is soft,weak, teasing.
On the other hand flat bottoms indicate very strong resistance and the reaction is 'reflexual'
On the other hand flat bottoms indicate very strong resistance and the reaction is 'reflexual'