Given the country's political history, a proper Labour party. Separate and different from the sham UK one.
ETA
At the moment the two major UK parties are Tory and Toryer.
ALBA, in the main, is a wasted vote. And, voting labour gets you another form of Tory. (Just look at the leaders of the party, north and south of the border). I can't stress this enough. Voting SNP in a UK election is not an endorsement of their performance at Hollyrood. It is simply a vehicle for the ultimate goal of an independent Scotland.
IF we still have the sham that is the assembly, I very much doubt I will vote SNP again in that election.