Isn’t the latency of satellite internet always going to be significantly worse? Unless, of course, you could make larger hops, avoiding unnecessary switching delays. But I don’t think that will happen, except some rare circumstances.
Fiber slows down Berlin <-> NYC by a lot. I usually use Wolfram Alpha for this and it's like 30ms fiber vs. 21ms vacuum.
So in theory starling could offer less hops and better latency. The detour to space isn't that bad either, ~1100km on a 6500km route, and fiber will need some extra hops and detours too.