The bank manager Alistair Darling, chairman of the Better Together campaign.
Weaknesses The UK chancellor who was at the helm at the start of Britain's worst ever recession, Darling is also a Labour politician who has to lead a campaign which includes a deeply unpopular Tory-led government.
Line of attack Fundamental questions about Scotland's currency, public spending and position in Europe after independence remain unanswered, while Salmond wants to risk the stability and protection of UK membership by gambling with the country's prosperity.
The salesman Alex Salmond, 59, first minister of Scotland.
Weakness Despite three years of Scottish-government funded campaigning for independence, most voters don't trust Salmond's promises on the benefits of leaving the UK and his reliance on volatile North Sea oil reserves.
Line of attack Scotland has the second strongest regional economy in the UK and highest employment rate, but is enduring cuts because of a Tory-led government that Scottish voters rejected and the mismanagement of a Labour government that Darling helped lead. Scotland is one of Europe's wealthiest countries and only Scotland's citizens can make the best decisions about its future.
guardian.co.uk © Guardian News and Media Limited 2010