If you had bad pimples it would be best to first cover with a green concealer (to reduce the redness), following it up with a high coverage concealer.
I’ve used the NYX coloured concealers before and they work great. For a high coverage concealer, it would depend on what shade you need (I am quite fair so there are only a few brands available I can use). I really like Too Faced Born This Way (I also use the foundation)