Which SSH key types (RSA,DSA,1024,2048,...) recommended/most widely used?

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When I generate SSH keys then a couple of different types are possible, e.g.

SSH-1-RSA 2048
SSH-2 RSA 2048
SSH-2 DSA 1024

If I have to select (only) one of them: Which is the recommended type?
Which is the most used (for Solaris/Linux target SSH server/computer)?


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