Perhaps a better comparison would be the RS7k vs. the MC-909, which is Roland's sampling beatbox with built-in synth engine.
In any case:
Roland's synth engine is deeper and allows for more tweakability. Not such a big deal in your case.
Roland expansion cards stomp all over Yamaha's years-old expansion card offerings. Better sounds, more of 'em, better programming. No contest.
The 505's "Megamix" mode is very similar to the RS7k's normal sequencer mode. It's the best feature of the RS7k, in my opinion. You can mix and match 16 different mini-parts by using a separate instrument sequence on every track. Sweet. The MC-909 omits this ability.
The sounds in the RS7k are, in my experience, a bit cheesy and "happy", in the vein of the RM1X. They can sound good with programming, but it sounds like that's not what you're after.
Unless the sequencer features are key for you (and yes, the RS's sequencer rocks), I'd suggest getting a used MC-909 for the same price as a new RS7k.
-Hoax
The wise man knows that he knows nothing.
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