A few differences:
* In 2000 it was one tipping-point state. Here, Biden has multiple states putting him over the top.
* The margin in those states is larger than in Florida. The final official Florida count gave the victory to Bush by 537 votes.
* 2000 involved a recount of legitimately questionable ballots. Trump's legal cases (thus far) have been judged by experts to be far less serious.
* Trump (so far) is not challenging enough ballots to give him the lead in the tipping-point state.