>Dragon Quest: Generic fantasy games of a consistently high quality with likeable characters but predictable plots and solid combat mechanics
or
>Final Fantasy: A wild gamble of either creative / pretentious settings with memorable / annoying characters that take themselves too seriously and gameplay mechanics that change every game
>Dragon Quest Although it may seem basic from an outsiders perspective, it genuinely has some of the best stories in vidya with unique elements. Often times time travel and dimension hopping is part of it. The only games that have generic stories are the ones like 8 that became popular in the west. Dragon Quest is literally the royalty of RPGs
>Final Fantasy Started off as a complete and total rip off of Dragon Quest. Once they got to the 16 bit Era they started to shed thier influence with some unique scenarios of thier own and the ATB system. Really came into its own during the ps1 era due to massive success in the west and brining the RPG genre to the masses with its easy to access difficulty curve. Square got too full of themselves though and started to use Final Fantasy as a delivery device for graphic fidelity often times ignoring core gameplay mechanics in favor of flashy cinematic set pieces. Hasn't really had anything to do with gaming since the PS2 days, more of a tech demo with lazy writing.
Basically Dragon Quest is for people who enjoy video games themselves and Final Fantasy is for those who like cool looking CG movies.
If you had to compare them mathematically, FF games greatness range from 2 to 8 when pretty much all DQ are 5, making both series 5 on average, got it ? Ok now check me out FF average is 4 when DQ average is 7 :^)