"the Best" is the one that suits your requirements , some people only test a single gun inside at the bench after a rebuild,
other people put a chrono up every time they have a plink, or take half a dozen guns out every weekend in rotation to check over.

I use a 'Competition Electronics Pro-Chrono Digital' V frame type because I like to test while doing zero checks, I've got a usb interface but the new ones are bluetooth.

I certainly wouldn't change yours just for the sake of it.