There is nobody alive who can unite this country at the moment.
I think it's likely to be somebody like Sunak. The mistake the Conservatives will probably make is to think that someone who is popular inside the Westminster bubble will be popular outside it.
Suella Braverman might have the guts and the brains for the job but internal stitch ups will mean that she probably won't get it. The parliamentary party will probably present the ordinary Conservative members with a choice of two, neither of which they actually like!