I moved over to Poetry recently. Pipenv traded on Reitz's cache as the Reqeusts author and got a lot of adopters, perhaps a little before the software was ready for the primetime. I only tangentially keep my finger on the pulse of the Python community but it certainly appears that they're souring on him [0], [1].
I wouldn't say more popular, but it's certainly gaining traction in a relatively short time and I prefer it. I haven't used it in anger but it certainly seems faster that Pipenv.