I've found it is either the Pocket Pro 2 or the Pact timers are the go to. If you look at the reviews of each, the pocket pro seems to have a few more settings. I also like how the start button is located on the side. I did get to use each timer at a local IDPA match a few weeks ago and i wasn't crazy about the Pact start button in the front. It works fine for self drills but using it with others it felt big and awkward in my hand trying to reach the button while facing the speaker towards the shooter so they could hear it.
Look up some youtube videos and decide what works for you.