Is it true about car rental double charges via c1 travel portal ?

I got my new ventureX CC and looking to book a car rental for 4 days.
I have already made a reservation through direct website (BUDGET) for ~200$ and pay later option.

However, seeing the same price in c1 travel portal too but with 10x miles and have to pay upfront ~170$ and pay taxes at pickup counter.

I have read lot of posts regarding the car rental company charging again even after paying/booking upfront through capital one travel portal due to payment not being transmitted properly.
is this true and is it worth to book from c1 travel portal ?

Im new to this process, any help appreciated.