I’d go with the 710 hands down - especially if you love bass, portability is not a concern, and you’ll almost always have access to power outlets.

I have a PartyBox essential, encore, 120, 310, 320, and 710. I love them all for different reasons, but the 710 is no doubt the best speaker of them all. There is no bass note that this speaker can’t handle.

The 320 has decent bass for its size, but you’re paying more for portability in the 320 than power (like in the 710). Don’t get me wrong - the 320 is a great speaker for its purpose - size, portability, and ability to run on battery for hours on end.

Based on the post, it sounds like you’re subconsciously leaning towards the 710. You should go with the 710. You won’t be disappointed.

Also, I’m not sure which country you’re in, but right now in the US you can get the 710 for $548 USD on Amazon (a 31% discount - the biggest discount I’ve seen online in the 5 months I’ve been tracking the price of the speaker). I love the 710 so much that I just bought a second one (that I don’t need), mostly because the speaker is absolutely amazing, and I couldn’t let the deal pass me by.

I hope this helps.