I could be talking crap, but I think the black one is bigger than the white one. I'm about average and have a white one which is just about the right size. So I'd probably go for a black one.
But yes as toycar says, fleshlights you'll have no trouble with!
I think I read a review where one person complained about the opening being too restrictive and that he had to cut it down and file it to size... So that may be an issue for you too. It's not a common problem but it may be beneficial to ask Lh's Customer Service about the size of the opening so you can compare with your partner's girth?
don't know about the tenga, but fleshlights are HUGE!
Well, they are, but I found the texture a bit strange. The internal stimulating pattern was pretty much lost when stretched out that much - it just gets pushed into the jelly-like wall. And the sleeve itself wasn't firm enough to give a feeling of resistance - it just kept on giving as it was stretched.
Now a lot of this will be down to personal taste, but I thought the Fleshlight was not really ideal for a larger man, even though it could happily accommodate one!
I don't think I'm that big but I've been told otherwise (I think I'm upper average more realistically), and I have no problems with the Tenga. It's not that long, so long guys may not be able to entirely sink themselves into it, but the head is the most sensitive etc anyway. Super thick guys may have trouble closing the Flip Hole once they're inside it but you don't have to use the toy in the locked closed way, although I imagine it's easier to use if you do. Let us know how you get on so anyone else with size worries can have them put to rest/confirmed.
The Tenga onacups are available in a 'US' version which are larger as they're designed for the export market.