I'm new to Mikrotik. Currently I have router on a stick setup with pfsense, HP1800 and Unifi 16. Looking to add a few 10Gb ports by replacing HP1800. Planning to setup a few vlans and trunks to Unifi 16 and ESXi box. Which is better option CRS or CSS?

Hi ho,

if VLAN is the only feature you need a CSS is all you need.
CRS has also a little router inside, but its cpu doesnt have much power. So its made for some little extra-setups you may need (maybe a wifi controller), but its not enough to route all traffic of the switch through the cpu. for this you will need a CCR-Router.

Look here to see how much traffic you can route through the router of the crs326:
https://mikrotik.com/product/CRS326-24G ... estresults