i went through this very same dilemma.
i now own both of them, but there was a two year gap in between me getting the first one and the second one. when i got the first one i was forced to choose between the two...
i went with the Ric, and looking back on it now, i'm happy with the choice i made.
The stingray is a workhorse. it's damn near indestructible. it's SUPER gig worthy... it's the type of bass where you feel like you don't need a backup. it's a tank. it growls, it spits, it plays nice if you use your fingers, or it'll tear your face off if you crank your amp's gain and use a pick.
but the Ric is a "partner," it's a "companion," it's "special." anyone whose found a special guitar or bass knows this feeling. it's more than a bass, more than a guitar... it just "fits" you, it "fits" your personality.
now, this feeling of "companionship" is a very personal thing, so i can't say that the Ric is THE ultimate bass for everyone... but for me, it made me want to play, and play, and play - i practiced every frickin day when i got that thing. and when i finally went in the store to get my stingray a couple years later, i noticed something cool - i was MUCH, MUCH better... and the stingray REALLY sounded better than i had remembered it. it wasn't that the stingray was better, but i could actually bring out a good tone from it.
it didn't make me regret not getting it first, not at all. but what it did make me realize was that the Ric had helped push me to a point where i felt comfortable slapping or playing faster licks or passages or solos.
and that's what made the stingray so much more valuable. i love the ric more than the stingray. but if i was honest i would admit that the stingray DOES have a slighter better tone. it IS a slightly better gigging instrument. but i don't play it every day. i DO play my ric everyday though... and i'm pretty sure i will as long as i can.
another main thing is the AMP YOU USE.
i have an Aguilar DB750, as well as an AG500.
i also have a Trace AH500x.
the Stingray retains an aggressive (but smooth) tone through all of them.
The ric is a little more picky. you need to tweak the Pickup tones and Volumes a little and setup the Eq's a bit to find that sweet spot. but once you do, it feels more like a Les Paul than it does a big, clunky bass.