I've tried: DSE801, DSE901, Smore m401, Joye 510, Janty eGo, Janty Stick, DSE905, Saber Touch, indulgence and probably something I've forgotten.
I think I get the best flavor from the m401 but those tiny carts make it frustrating for me to use. I keep about a dozen filled with a favorite flavor or two and enjoy them in the evening and end of day. Way too much work during the day or when I'm out.
I like the flavor of the DSE901 and the battery life and cartridge size is acceptable for me to take one with me when I go out and to use regularly during the day. I usually have the 901 atomizer stuck to the 905 body at my computer and the Indulgence body in my living room. I drip when watching TV but not generally with computer use. I keep an eGo with teaberry in my living room and atomic cinnacide in the computer room. Nice to pick up for when I want a nice strong vape or to taker a break from whatever milder flavor I'm vaping that day. I end up needing to charge those batteries once a week at most.
When I'm in a mood for a way too strong for me but I like the flavor juice I grab the Janty Stick with its penstyle (801) atomizer. Those huge plumes of smoke and delightfully mellow vape are great when I use it with those heavy flavors.
You'll notice I didn't mention the 510 atomizer except in passing with the eGo. I don't care for its taste in general and don't like the battery life of the 510 vs. the 901. Actually when I head out and want to grab just 1 thing I'll take a KR808D-1 battery with 901 atomizer or a cartomizer. Those batteries are great and I like their longer life over the regular 901 battery for just about 3/4 inch longer PV.