The original FX chrono is a good bet, easy to use, great features, can be moded to run on a power pack, easy to get the info into your Pc to make graphs etc.....
It measures to the nearest 3fps, so not ideal for people doing high end tuning work, but for anyone wanting a chrono accurate to 1% then they are a great option.
Making a mockery of growing old gracefully since I retired
I use a £10 chinese one, works as it should, easy to use, and use my phone too calculate it. ive checked it against the very expensive club one and there really isnt much in it.
"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.
I’m the same quite like the little sub £20 Chinese Chrono I once tested it back to back with the clubs SKAN and there was only 3fps variance.
Plus the Chinese one is great in the garage for quick testing as the rechargeable battery lasts ages.
I have a 21 year old Chrony F1 that has worked flawlessly over the years.
Master Debater
It's a cracking unit , May have to put a pen or your barrel though the unit to reset it now and then once switched on but these must be near 30 years old, Been tempted to get a new one, its the diamond window that puts me off, Maybe I'm just used to a big square window,