Speaker recommendations

I'm looking to replace the OEM speakers with one of the least expensive 4x6" and 4" speakers that Amazon offers. It looks to me like the Pyle series has the best ratings and price-per-value. A pair of the 4x6"s for the rear hatch deck will run me less than $30 after tax right now.

Has anyone tried these out yet?

e.g., https://www.amazon.com/3-Way-Univers...9260928&sr=8-2

or these: https://www.amazon.com/Pyle-Three-So...9261414&sr=8-2

or these: https://www.amazon.com/Car-Three-Way...2s9dHJ1ZQ&th=1

(And on a separately note... I don't know WHAT Pyle is doing, offering these different models like this. The black and blue versions seem to be exactly the same, while the (less expensive) yellow version seems to have a larger woofer magnet, but smaller tweeters?? So weird...)

I got ROCKFORD FOSGATE 6X9's 3-way's inside of scosche sealed speaker boxes. super crisp bass that feel in your chest, 50 watt pioneer amp. sound is amazing for price n power. used dbl back tape n cut 3/4 black melamine to use as a shelf behind rear seat. mounted in place of rear deck cover on hatchback