The main difference will likely be style of approach. Whoever is chosen they will surely have a more formal & business like attitude.
Boris was fairly unique. More a used car salesman than a negotiator. He's not really a stereotypical Tory. More a representative of the floater voters perhaps. Something of the Englishman abroad about him.
But the party were elected on their manifesto. And they had ousted all those who did not want to condone any Brexit of any kind. So it's unlikely anyone with significantly different ideas gets elected as leader.
The most interesting bit will be around whether they go with someone seen as close or removed from Boris Johnson.
Kyrgios is due to face some sort of domestic assault charge when he returns to Australia. Another reason not to buy into the "oh he's such a maverick, McEnroe come again, people just don't like him because he's confident and Wimbledon people are just being snooty and he's *Box Office*" stuff. He's a tit.