The Leo (with a unique
801-type atomizer,
not a
901 atomizer) and the eGO (based on the 510 atomizer) are two very
different models. About the only thing they have in common is that they both are examples of the new wider diameter, high mAh e-cig.
My personal favorite (of all the many e-cig atomizers I have tried) is the Leo. [See
my review.] I
love the feel of the vape. But I have always preferred the penstyle (e.g., 801) atomizer over any other, including the massively popular 510. With the protective cap on, the Leo looks like this:
With the cap off (i.e., when you are vaping it), it looks like this:
However, I do not necessarily recommend it as a first e-cig. The Leo is not compatible with
anything else (including with other penstyle atomizers). The eGO (and its many 510-based brethren)
are compatible with each other, with the 510 and 306 atomizers (and the LR versions of those attys), and with enhancements such as higher-mAh
XL batteries,
mega eGO atomizers/cartridges and cartomizers.
Of the eGO-type e-cigs, the Joye eGO/Tornado (launched by Janty and Totally Wicked) was the first and therefore deserves top honors. It was the most significant innovation in vaping since e-cigs were invented. However, it also tends to be the most expensive. There are also the Riva, Hello 016, T-Rex, Inferno, KGO, at least two different models called "VGO", and "eGo" knock-offs. I think the Riva, Inferno, and VGO (JSB's is the one I'm most familiar with) are the most interesting choices. I would steer you away from the T-Rex and the knock-offs; I don't know enough about the KGO and Royal Smokers VGO to comment; and the Hello 016 is clunky looking (and is less available than it once was).
Of all of them, I agree with roxics: the
Riva (original 510 version rather than 901) is the most cost-effective (and it is fully compatible with the eGO and all its enhancements). It came out shortly after the eGO/Tornado and has stood the test of time. At either of two lengths, it has a bit more mAh than the eGO (750 vs. 650 and 1100 vs. 900 or 1000). If you use 20% off discount code "ecf", $30 will indeed get you a two battery/two atomizer 750 mAh Riva kit ("LITE BUNDLE") from
Liberty-Flights. It really is a great deal.
If you would prefer higher mAh and/or a longer PV,
BreezEsmokes is the first U.S. supplier (to my knowledge) to sell the Riva 1100 (guess what the mAh is). It costs $48 (again two batts/two attys).
With a mega eGO atomizer and cartridge, it would look a bit longer than the top model in this photo of eGO configurations:
