I've never been able to play with coins, that slippery uneven border makes me sick with its 'zzziiing' sound.
The best pick I ever played with (actually the pick I currently use) is the Dunlop Ultex 1.14, next comes the Dunlop Tortex 1.00
They DO make metal picks as well. So if you like the bright attack of metal, you can get it while also enjoying the advantage of a shape that actually works for picking strings. Personally, I'd LOVE a pick made of Zildjian cymbal bronze shaped like the 2mm Stubby that's currently ruling me.