I got the soft kit a while ago, and later updated it to hard tubing.
I would definitely recommend hard tubing over soft, because soft tubing will eventually leach plasticizer and gunk up your waterloop.
But, I wouldn't advise to get thermaltake kit: the radiator is Aluminum while the block and fittings are copper (A BIG NO NO). It will limit you to their terrible coolant too.
My advice would be to order everything from abroad, EK, Alphacool, or even Barrow and Bkski from Ali Express. Would cost around the same as the kit you're thinking about, especially if you have someone that can bring the stuff with them.
I have the bending kit and pipes, and would lend a hand if I have the time. It's not too hard, unless you're making a tricky bend or something.
Here's my PC:
I replaced the radiator with an all copper one from Magicool on Ebay, and got all tubes and fittings from XSPC on Amazon
The coolant is Mayhem X1 red