If I was to choose only one it would be hands down... Reo Grand... My 18650 Peko has been absolutely awesome since day 1 I put it together and it has taken a few tumbles along the way but I am sure its just waiting for that one tumble to need some attention. They both hit very similar with the right atty / setups on them.
The Reo has been spit out of mower, fallen off the ladder several times, been knocked off the table, kicked across the room, and yet all I have to do is pick it up and
vape it... I do enjoy the size factor and squonk hole placement on the Peko though. They both have some strong pro's to both of them. You couldn't go wrong with either one.
If you get either and end up passing it along to your wife, just know that the Peko can be repainted and the Reo can have a Jwrap put on it if she doesn't like the color of it. Both are very inexpensive propositions....