Okay so if one goes with the bilogicial pod how do you think Alfred would develop as prince of Wales and later King?
Hard to say,
assuming that Victoria survives the double blow and lives for roughly the same time
I'd assume Alfred would be much like his brother ... a solution in search of a problem.
in OTL much like the current DoE he was a serving RN officer
in this ATL, I think Alfred would be denied that career
(He was genuinely a Captain though his ship was given mostly diplomatic and goodwill missions
which to all accounts he performed well ... so I suppose he could have held his own as Heir)
In his youth he was physically tough enough to survive an assassins bullet in Australia,
Shot in the back while at a fund raising event for a local charity ... the man was probably mad ... even the Prince argued against execution ... but he was an Irish emigrant and hung "just in case"
However in later life, he became frailer.
In fact Alfred died in 1900 i.e. before his mother so he would never have become King unless you kill her off too
As to his character
In middle age, he was know as a cultured gentleman and philanthropist - though in music his taste was better than his personal ability to play.
As for actual political ability
When promoted to Admiral, and given a real fleet to handle, he was well regarded as an organizer and something of a technical expert on naval innovations
OTL he only became a nominal ruler in 1893, long after Saxe Coburg had been swallowed by the Prussian Empire
so he was only a figurehead but in his short reign he was accepted as well intentioned.
He might have filled in his fathers role as the Queens balance wheel better than "Bertie"