Logic would state yes, removing the muffler will make it louder. Better? That's subjective. Better for you may not be better for somebody else. Best advice there is go to a meet and see if you can find anybody with a similar setup... and see how you like the sound.
Muffler deletes will be a lot louder than the Q300.... Q300 is known to be one of the most quiet exhaust choices. Muffler deletes on the other hand are exactly what they are.
The Invidia Q300 will provide a quieter and more refined exhaust tone than that of the Nameless Axel back delete. I enjoyed my Q300 much more than I enjoyed anyone's Nameless axle back deletes, but that is only my personal opinion.
Wouldn't call it a monstrous resonator, but you're right, I didn't consider the resonator.
I had a non-resonated "N1" stile exhaust with a cat delete on my Mazda3 ten years ago. Thing was loud, but with that particular car, not as loud as the above configuration. Different car, of course. Also depends on who makes the system. "N1" stile mufflers are not all created equally.