I don't buy any of the expensive shiitz anymore. I used to like to confirm O with the CBE digital, but now that I'm on cycle 5, I don't even do that anymore. It is such a waste of money. At this point I'd only buy a HPT at CVS/grocery store to confirm a +HPT, cuz I like to pee on stuff, and it is nice to see 'pregnant' pop up on the screen.
I've used both and I like Wondfo better. I've had evap issues with the other.