The eGO atomizer (a.k.a. Mega eGO, XL eGO, or Monster eGO) and its accompanying large cartridge has a much greater
e-liquid capacity than the 510 atomizer/cartridge ... and it provides an integrated look with the wide eGO battery without using a cone.
It does
not, however, produce more vapor than the 510 atty. What does that is an
LR (low resistance) atomizer. You
can have the best of both with an LR eGO atomizer ... although, ironically, it is recommend that you
drip (rather than use the mega cartridge) with any LR atty.
LiteCigUSA sells the LR eGO attys for $11 and standard resistance ones for $10.
Heaven Gifts (China) sells the LR eGO attys for $7 and the standard resistance ones for $8.50.
Janty (Europe) sells only the standard resistance eGO attys for 8,50
(incl. 19% VAT); five-pack without guarantee for 34,90.
Totally Wicked (U.K.) sells the Tornado-branded LR eGO attys for £7 and the standard resistance for £11. You might know better than I which have the lowest shipping costs to Germany.