Meant to add, Saturday night, leaving a venue, my wing pulled up Uber and it had 3x surge pricing. I pull up Lyft, no surge pricing at all.
Lyft will probably never surge more than Uber. And if Lyft is surging 100%+, like Drazen suggested, a cab might be a better bet. If you're rolling somewhere close and you're with girls and want to make it quick, a cab is probably best if it's already sitting there.
Lyft and UberX are virtually the same in base price. Unless Lyft is not available locally, I see no reason to use Uber at all.