I've done my research but still cant fully decide whether to use the
High Replication or Master/Slave datastore. Hypothetically speaking,
if my app were to become popular it would require many reads and
writes (it's an advert serving platform).

I realise the High Replication datastore uses more resources, is
slower reading and writing and would be more costly, but it does have
the reliability I need. On the contrary the Master/Slave is faster
which is important to me.

Basically, what is the opinion of people who have used both in a
production environment? Should I stick with Master/Slave or make the
change before it's too late?

Thanks

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