I don’t think you could get a cigarette paper between RLB and Rayner on policy - I think their differences are all down to their personal experience and different approaches to what politics is.
I think Starmer has a tendency to be wooden and that’s his major issue, but I don’t think he’s a dangerous centrist and I think having a Barrister opposite Johnson at the dispatch box would be very useful. I also don’t think he would dominate a working relationship with Rayner.
The main reason I won’t vote for him is that I think the experienced female candidates are all easily good enough be to leader, which means one of them should be leader barring a genuinely bad campaign. I would vote for Starmer over Phillips though.