Which way to go

Ok, here's the deal. I'm making a map that is kindof like an arena map, however, a few things.

The units have set hp and mana, these do not regenerate and can only be regained by use of certain items.

ok, now the problem. I was planning on making the map where the units had no basic attack. Thus all your attacks would be abilities. Your abilities will drain your mana as you use them, so you have a certain amount of mana and you have to learn to use it wisely, otherwise, you could find yourself without an attack.(don't worry, there is more to this, I just want you to get an idea)

The other method, is to allow the units to have a basic attack, a small one that uses 1 mana each. The problem with this is if someone doesn't want to use the basic attack, I'd have to set up a way to turn it off.*not a big deal, but still*

What method do you think you'd rather play with? TIA for answering.

How 'bout a mana stealing ability? Like you have to go REALLY close to someone, and using 1 mana, you can gain back let's say; 6 mana?

The cooldown will also be fast enough for them to keep using it.

Well, perhaps...but, I don't want to have anyone not able to attack...the point was, would you rather have a basic attack+ 4 abilities, or no basic attack and 4 abilities.