Confused... Polk Momo or Db series? Which one better?

[phongnguyent]

If i am reading the website right. the momo are the best.. but why are the momo cheaper than the db series?

I'm just trying to get the best speakers for my truck..
2000 4runner limited

and if anyone can tell me the correct size for my truck i would REALLY APPRECIATE IT...

mobiletoys say
Speaker Opening Size: 6 1/2" front
Speaker Depth: 2 1/2" front

Speaker Opening Size: 5 1/4" rear
Speaker Depth: 2 1/2" rear

but polk gives me 6-3/4" db6750 (by the car fit guide) .... and no speakers for rear..

Also personal question does polk outperfrom sony, alpine, and so on and so forth?

[Fastmerc]

Best to ask this in the car audio forum. Good luck :)