The Ricoh is probably newer ( maybe mid 1980's ?) and I think will have more usable life,
for the person who is a film user rather than a collector.
The K1000 should appeal more to a collector.
Features I prefer on the old K-bodies is that the match needle/leds are clearly visible in bright and low light
and shutter speed can be easily adjusted with the camera up to the eye,
and the KR-5 is good for those.
Here is my KR-5 super 2 which I have used a lot over past 30 years, and still in good condition.
https://app.box.com/s/eyzhpb7b4h23x92m3dw5knjg6s2ynlbh
I am going on a trip to China and Australia and I like to take a film camera with 2 old K-lenses.
So I am thinking to take those old Rikenons along with the KR-5 and K_S1