I have used all their products for years for catering and comps their customer service has been outstanding.this is one of the main reasons I carry there line of products.
I like the ten cfm better it's more versatile you can close the air slide down on it for smaller cookers and open it up for larger one if you have them. The price difference is small.
Where they Farmlands best from sams I have gotten poor yields from that brand but not that bad. I think some one was doing some nibbling before packing
The both work the same the stoker is a bit more user friendly with wireless use with your laptop I Phone extra. Guru has a big edge on customer service and quality.