The main difference is in the padding. When the POODLE attack was pre-announced as only affecting SSL3 and not TLS1.0, that was enough to predict it was going to be a padding oracle.
I think it’s fair to say they’re very similar, with a few “bug fixes”. It’s been a while since I’ve thought about either though, and might be forgetting a few things. I’ve only ever implemented SSL3 and TLS1.0 together, so there may be some details I’m forgetting.
nextgens
TLS1.0 introduced modularity via the concept of "extensions". It's everything but a minor evolution of the protocol.
I think it’s fair to say they’re very similar, with a few “bug fixes”. It’s been a while since I’ve thought about either though, and might be forgetting a few things. I’ve only ever implemented SSL3 and TLS1.0 together, so there may be some details I’m forgetting.