[cliveh]

Condenser.

You can use a higher grade paper with a diffusion enlarger but it just doesn't look the same.

I love hard gritty grain.

Dust is all a matter of being careful, having good eyes and using A-grade film; it's perfectly avoidable, even with six surfaces.

Are, now you raise another moot point. In my own darkroom I always use glassless carriers, even on my diffuser enlarger.