Slurp!! Defo, when you have a good tea on our hand, it's not enough to sip, snif or snort. I would describe myself as in the middle of Slurpper and a Chugger. If it's a hot day and there is ice matcha on the table - CHUG!
I always sniff the tea first. Then a first slurp. If its really hot i`ll continue to slurp, it it is a bit ccoler then its sipping time (my favorit). If the tea was forgotten (because of life) then I gulp before it becomes even cooler.
I guess I'm with the majority in that I tend to alternate between sips and slurps. With stronger flavors, I'll tend to relax and sip more often. With more subdued/mellow teas I find myself slurping without thinking about it to try and bring out the flavors more.
The answer really depends on the tea I am enjoying. A Dancong oolong would be a sniff and sip tea. I like to slurp some teas also to take in more of the flavor profile. Even the better flavored teas can be sipped and savored. Gulping is for the cheap stuff. A nice masala chai is a spice lover's delight and a great way to enhance lesser quality teas. A nice Silver Needle tea is great to let fill your mouth and absorb slowly. The labor and effort to produce these teas certainly warrants such attention.