Thank you so much for your nice post! Paypal is kind of annoying in terms of time delays but efficient for so many other things. The nice thing about exchanges is the liquidity. I think for BTC crypto derivatives if you want something standard maybe exchange will do but for bespoke ones you'll have to OTC!
Those smaller exchanges can be troublesome though! HitBTC is killin' me at the moment 3x in a row I had a withdrawal stuck for days....At time of writing I have a Dimcoin withdrawal that has been pending for 3 days now :)
Man that is not easy to deal with...