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Two issues I remember hearing - there's a much larger launch window for landing on the ocean barge and something regarding approval/ regulations being more stringent for a land launch. Blue Origin's test flight didn't go too high so it didn't face the same issues.

I may be completely wrong here but I'm fairly certain that's what I remember reading.

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Yeah you're wrong, it's to do with the speed they are travelling to get the launch trajectory, they lack the fuel required to make it back to land

It has nothing to do with the height. Both rockets go 'up' a similar amount. The difference is how far sideways Falcon 9 has to go (since it is launching a payload to orbit).

https://what-if.xkcd.com/58/

Have Blue Origin gone 'up' further than ~100km ?

They're in that ballpark. I know the capsule exceeded 100km. I don't know if the first stage technically broke that or not, but it was closer if it didn't.

I think SpaceX are in a much higher ballpark?

Not really... A few dozen km altitude difference doesn't mean a whole lot. The _much_ more significant difference is that Falcon 9 is traveling sideways at several times the speed of sound. New Shepherd is "just" going sight up and coming back down.

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