Para chord accessory chord etc are all expensive options IMO. I like using it for many things, and despite having access to lots of it buckshee through work I still couldn't bring myself to cut it as and when I normally would a piece of string or twine.
So I guess it's a case what one is doing with it that would determine what would be best. For me and my usage rope string cord etc is a consumable item and therefore I like to keep the cost reasonable.
I bought 300m of 3mm green braided polyprop last week in the stornoway fishermans coop, cost £8.50 which I got discounted to £5 as I'd also bought a helly oil skin jacket. @ around 2.8p per meter it's not too pricey, there are cheaper options too. I like the idea of brick string and the various other bulk strings and chords but I'm in the way of fisherman's mending twine, for most stuff, it's just hardier. Knots are trickier with braided polyprop but it unties easily enough and I'm quite used to it.
My favorite for tight knots an lashings is tarred polyester flat braided cord, but thats getting pricier.
For heavier jobs I can't see past three ply polyprop laid rope of various diameters, splice eyes in it, join it, a round turn twist and tucking the end through the lay on the bight (for a quick strong and easily releasable end knot) etc, wonderful stuff to work with.