I've tried only two clearos in my entire life, both from Kanger. The T3 wasn't bad at all, IMO. Currently using the M3.
Here's the thing -- depending on what your lady prefers, battery-wise, that might be more of a determining factor in which clearo you want to go for. There's a lot of praise in this thread for the EVOD, but if she wants a 510 and the EVOD hasn't got the proper connection, that might be a non-starter.
I've also noticed among the women I've persuaded to make the switch from smoking to vaping a preference for smaller and slimmer. That could not only influence the kind of battery she'll want, but the kind of clearo she'll want as well, in which case all roads lead to something small like an M3 (or one of its smaller/slimmer competitors like an iClear or Tidy10, which I can't advise you about.)
The M3 is a solid little performer, with good flavor and throat hit. It's also easy to fill, easy to clean and easy to use.