The T5 Essence has a lighter nutty taste. I mixed mine at 5%. That probably would change if more was added.
The T5 is what I have in my DID right now. I mixed mine at 8%. It's really good, it has a nutty taste to it but I don't get peanut out of it. I've tried a few vendors 555 mixes in the past and didnt care for them. I didn't know that T5 was 555 when I got it and only mixed a batch because the flavor smelled really good. I made a 60 ml bottle to add to my stash. I havent graduated to 120 ml bottles yet.
I think there are quite a few vendors out there that make there living off of Hangsen flavors.