Marine SSB versus HAM

[Fathom42]

I'm new to all this, so please forgive a basic question, which is this: I have 2 SSB radios that were aboard the boat I bought, and prior to that a friend gifted me a Kenwood HAM.  Question is, is one better than another for worldwide comms, ?  I'm looking at this from a preppers point of view, the HAMs seem to rely on repeaters, which are vulnerable, the SSB doesn't, or am I missing something ?  ANY guidance would be greatly appreciated.
Thank Y 'all,
Fatholm42

[gil]

Hello. Marine radios are usually more rugged than amateur gear. However, browsing frequencies isn't always as easy, as most models require you to program the frequencies you are going to use...

Gil.