I assume you are talking about coconut, not cocao (chocolate), right? I have used cocoa (chocolate) shell mulch. It was fine, but not significantly better than regular cheap mulch. Millet used to recommend cocoNUT husk chips. I have never seen it for sale in person, and I am too cheap to pay to have it delivered. Where are you seeing coconut hulls/chips online? It was always expensive when I looked.
I read a forum post somewhere (woodworking forum?) where somebody suggested that insect-repellant properties of aromatic cedar are only true of old mature cedar, and that most cedar sold does not have any meaningful benefit because it is too young. Since reading that I have switched to pine bark mulch which is dirt cheap, because it all seems to rot quickly anyway.
I highly recommend a significant portion of Turface, or gravel or perlite to aid drainage. If you use a large portion of mulch you will likely have to repot every 6mo as it rots quickly, even cedar.
My current mix is around 30% turface, 50% mulch, 10% perlite, 10% peat. I'll probably drop the perlite when I run out of it, I still have a big bag to use though. I'm not sure if turface is actually better than perlite, but I like that it is heavier as containers are always blowing over in heavy winds.
I understand that the agricultural term for repti-bark is "pine bark MINI nuggets", but all I can find locally are "pine bark nuggets" which are far too large