My life would suck without you
They're not all that different. Personally I would play Blue and then once I get Yellow, play that. Also Gold/Silver/Crystal go off the events of Red/Blue more than Yellow imo. I wouldn't worry too much about not wanting to finish the whole storyline either. It can be finished comfortably in 10 hours. I've even done it in under 4 (don't do that though, it was painful). I suppose if you play both, you get to use a wider variety of Pokémon.