Heavy bag VS Aqua bag [buying]

Hello. I've been boxing for 1.5 half year aprox. But its now when im really motivated and i want to also do some training in my home so i can improve faster, at list strength and cardio.

Recently i bought a double end bag and its grest for training the timing and precision. But i feel that having a big bag would help a lot for training power punches and intense cardio. The thing is i dont really know if i should get and old school heavy bag or an aqua bag. I've been look and i kinda know already the pros and cons... But, if you only could pick one (having also a double-end bag), which one would you choose and why?

Thanks!!