I think there is little point in voting Scottish Labour, unless you enjoy history repeating itself.
We are back where we were in the 1980's, with a Tory government not voted for in Scotland, in a country where over £35 billion of public assets have been sold- just as housing stock was sold off in the eighties leading to a crisis which is still with us today.
The steel industry is being left to die in the same way that the coal industry was. That has cost us billions buying coal from overseas to run power stations. If the steel industry is allowed to close the same will happen.
Yes, Corbyn may get into power in 2020, but the country will be in huge amounts of debt (it's 1.6 trillion, up from 856 billion when Labour were last in power) and there is still an annual deficit which is unlikely to be gone in the next four years. So he would have to spend a lot of money to pursue socialist policies, and rebuild the welfare state, at a time when we will have no money. This will make them unpopular, Tories will accuse them of incompetence, and they will lost the next election, or the one after that, and we'll be governed by the Conservatives again.
I can't see any way out of this other than independence. This cycle is never going to change, and it is damaging for Scotland to be ruled by Tories we didn't vote for who don't act in our interests, or Labour governments scrambling to repair their damage.
I would consider voting Scottish Labour if Scotland had independence, and they apologised for the Iraq war (as Corbyn said he would do before he was elected), reinstate clause 4, and have at least some socialist policies.
Until that happens, I don't think voting for them will change a thing.