Planning first water cooling loop




so here is the loop that im planning
so im posting it on here for everyone to pick appart. im using all bitspower fittings and the main arteries are 13mm ID then it gets necked down to 6mm ID for the runs to the CPU and GPU.

the biggest thing im having a hard time with is choosing the clear flexible tubing. on there is 3 different types im looking at: Tygon 'non-porous'; Tygon Plasticizer free; and Tygon Laboratory tubing. in barely see a differance, so whats the point in having it on the market in a liquid cooling store?
any advice on which tubing to go with (not rigid [sorry, not this time - it does look amaxing though]) would be greatly appreciated.