Both Redis and Hazelcast are memory based databases, so in theory, they should provided the same speed and performance. Looking over the docs for Hazelcast, you will get better support with Redis because of the wide amount of Libraries for interfacing with the database. Hazelcast looks like they only have java libs, Redis has one for every language.
Answers:
You will have to test this on your own, as far as I can tell different comparisons shows Redis as faster one of them is here, but i won't say these benchmarks are 100%
They should be both reliable, but I can not vouch for Hazelcast.
Maybe...
I would go with Redis, because I find it is the most usable and it has great documentation.
