Which one of these would be correct?
"Articulations" are placed on the part of a tied note where they make sense (depending on whether they are relevant for the start or the end of the articulation). An accent would be placed on the first part, a staccato or tenuto mark or a fermata on the second. It would, however, be more customary to write a shorter note and a pause instead of using staccato marks since neither the "as short as possible" or "half the written note value" interpretation of a staccato mark are really comfortable to use on tied notes.
As a rule of thumb, try thinking about what will happen when the tie is broken across lines: where would you want to see the articulation in order to be able to play this properly?
Either is correct, depending on where you want the emphasis placed. Yes, I know an acoustic piano (or plucked string instrument) cannot achieve the exact effect, but all other instruments can.
And I suspect skilled pianists will use the suss pedal and gently restrike the key to approach a "hold and then emphasize" effect.
To go a bit further, suppose you were writing a "dot", indicating staccato. A dot over the lead note in the tie wouldn't make sense. (I would strongly recommend that any staccato note be written as a single flag rather than a tie. I'd find that easier to read)