One of the things you need to add in your post is what you will be using the light for. Is it for general home duties? A light to put in your glovebox? Law Enforcement/Military? Camping? Caving? Does it need specific accessories like filters, weapon mounts etc...
The S2200 and TN30 are both very good lights manufactured to high standards. Its like trying to ask if Lexus is better than Infiniti or vice versa. Can't go wrong with either really. Just boils down to personal taste and application.
The S2200 is significantly larger and heavier than the TN30, so if you are going to be carrying the flashlight around, bear that in mind. Both are bright as heck for almost any practical usage, I doubt your eyes can tell the difference between 2200lumens vs 2780 lumens. The S2200 offers 3 modes + strobe, the TN30 offers 6 modes + strobe. So if you like varying degrees of brightness, the TN30 is the way to go. I also reckon Thrunite finishes its products to a higher standard than Solarforce when I compare my S2200 to my TN32. Most users outdoors very much prefer the neutral white tint on the MT-G2 emitter in the S2200 to the cool white XM-L U2 in the TN30 to increase colour rendition and contrast especially in dense/wet vegetation and misty/foggy conditions.
**Update: I just found out the TN30 also comes in a XM-L2 T6 Neutral White version which also boasts 2780lumens of output. I guess now its even worse trying to split the hair that has already been split!**
I reckon the Acebeam(Supbeam) K40M is the perfect hybrid between the S2200 and the TN30: it uses the same MT-G2 as the S2200 and the same control functions as the TN30 while boasting 3000lumens! The K40M is somewhere between the S2200 and TN30 in terms of size and weight! Perhaps you might be happier with the K40M than the S2200 or the TN30?