Genuine Innovations Ultraflate Plus for me:
http://www.genuineinnovations.com/bicycle/mountain/ultraflate-plus-clone-2.html
Works really well on Presta (haven’t tried schrader but it’s threaded) and if you don’t need a whole cart you can lock the trigger off. Lets you store the cartridges inside upside down so you don’t have to break the seal until you need it. Takes threaded or plain so you’re flexible of the cartridges you can use. I buy the cheapo brewing ones online, about a 10th of the cost from a bike shop! Last used a quick squirt at the weekend to pop some tyres on that my track pump couldn’t get going when setting them up tubeless.