g-pen or micro g-pen which for bho?

Regular G.  I have both now and the micro sucks.  Much smaller hits, no reservoir, leaks if turned over.  It's smaller but the regular is pretty small to begin with.

 

If you have shatter or wax get the mini g or the g pen with g coil. If your vaping actual oil get the g pen with g tank.

 

For the mini g is it better with it without the screen?

 

Without for sure. You want your oil right around that coil/wick below the screen and you'll get giant hits

 

I'd go with the g pen, it feels better.