I'm definitely a fan of both - it was amazing to rediscover after a long time away (I'd forgotten somehow!) how good cold potatoes can be in potato salad or the like.
Also really like rice salads at times now too - but obviously be aware of leaving rice out too long out the fridge (more than half a day, after it's been cooked); or over a day or so in the fridge, for listeria or other issues - especially with the white rice.
Cooked brown rice definitely does a lot better keeping in the fridge for a while than white (even up to a week, if your fridge is clean). You obviously need to re-heat it up thoroughly, and just the once again.
Craving potato salad now...
)
"All people are made alike - of bones and flesh and dinner. Only the dinners are different.”
Gertrude Louise Cheney