Only one of those technologies fills the same role as Postgres and MySQL (_especially_ MySQL Cluster) brings a host of other problems to the table. There is no silver bullet and it ALL comes down to use case.
I work in a GIS shop, and I do mapping and location based stuff on the side. I am a fan of Postgres. MySQL may have some spatial components, but it's like saying that you're a pro painter cause you bought a $200 paint sprayer at Home Depot. MySQL does have cluster/replication support, but their bolt on stuff feels, well.... bolted on! Every time I use a new Postgres feature, I feel like it was actually developed. (hstore is the newest thing I'm working with)
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Only one of those technologies fills the same role as Postgres and MySQL (_especially_ MySQL Cluster) brings a host of other problems to the table. There is no silver bullet and it ALL comes down to use case.
I work in a GIS shop, and I do mapping and location based stuff on the side. I am a fan of Postgres. MySQL may have some spatial components, but it's like saying that you're a pro painter cause you bought a $200 paint sprayer at Home Depot. MySQL does have cluster/replication support, but their bolt on stuff feels, well.... bolted on! Every time I use a new Postgres feature, I feel like it was actually developed. (hstore is the newest thing I'm working with)