I prefer the cyclone because it's SS. Not a big fan of brass in the juice path anymore. I know sometimes it's unavoidable and you can pickle it to remove surface lead too, but since there are SS options, I started to opt for them.
Additionally, I found that with the RM2, possibly because of the semi hollow ceramic shelf, would sometimes leave juice in the catchcup unless I used a thick oring in the catchcup and really wrenched down on the base.
My theory is that juice collects under that shelf and in some situations, like overnight, or when not used for a while, will rapidly drain out thru the slots in the 510. Dunno.
I get zero juice in the catchcup with cyclones and chalices. Yes the catchcup was made for juice but I'm a little OCD about juice anywhere outside the RBA and juice bottle.
But vape wise they can both be built to provide an exceptional vape.
