[upofadown]

No they are not. It is just some sort of internet legend going around right now. If I had to play the odds I would consider RSA more secure than curves simply because RSA has been solid for much longer than the current curves have existed.

[zinekeller]

There's a cherry on top there though: shorter RSA keys are easily breakable now, so most recommendation now focuses on extending from the defaults. It doesn't help that the practical default for SSH was 1024-bit until 2019-ish (OpenBSD folks: yes, OpenSSH did move to 2048-bit RSA way earlier, but OpenSSH builds on other OSes don't move that fast).