i used spd's. i only clipped out once but i wasnt going too fast. the feeling is like you're really connected to the bike when you have them. skips and skids are a breeze but i didn't like the idea of being locked in. i know there's the argument that its a natural thing when you need to bail out clipless but i didn't find so for me. it seems more natural using clips since all you do is pull out and your out. both have their dangers when skidding but thing of it this way: if you in the mid of a skid in clips and the strap breaks it may be more natural for you to pull out the other foot and bail as compared to have clipless and you unclip while the other is locked in. i thought about this and decided that clipless on a fixed is not my cup of tea. also, its annoying that you can only where one pair of shoes with clipless; with clips you can wear so many other shoes making it more versatile.

if you want complete control then go clipless (you will love the power u get) plus your ride will be easier because of the power transfer will be direct. i wont bad mouth clipless at all because as far as function goes, they rule over clips, but as far as practicality and versatility,they are not as safest thing to use in the streets. its is quite scary having that happen

if you want options and convenience stay with clips. i haven't tried double straps but i made some ghetto ones for myself and they feel good to me. i think i want that to be my next upgrade: toshi doubles (i have the single and they are awesome) and mks track pedals (i have wellgos for now that are uncomfy because they have ridges on the platform and i have soft sole pumas). find that perfect ratio of the straps being tight but easy to pull out of.