I liked Rob's impressions shtick and Lee's reaction 'don't', just keeps things bubbling along.
David has his angry ranting shtick.
I don't have a particular preference for either Angus or Rob, as long as I find it funny, just different personalities.
Martin Clunes is a good value guest on these things, the couple of times I've seen him in real life 'off duty' he seems to have a permanent $hit eating grin on his face, just a happy, funny chap.