Well since its non custodial and you don't write down your backup in the settings you could lose access
With WoS they can recover everything for you
Discussion
But ecash isn't actually noncustodial in that sense neither, is it? As in, if the mint disappears, I don't have any way to get back my sats? So from a fund security perspective, I suppose the main question is if I trust the mint more or walletofsatoshi. But privacy-wise ecash wins hands-down of course.