Watching sound test videos the Dead air Nomad Ti is on average 139. Something dbs. It also looks as if the helios is virtually the same. Infact all the cans appear to be in that 139-140dbs with 6.5creeds.
It's like splitting hairs for dbs. The tones maybe different?
Also is there a BEST PLACE to purchase? Has sales or maybe even a black Friday deal?
Pewscience.com is the only thing worth looking at for sound suppression analysis.
https://pewscience.com/rankings