I love this topic and such an incredibly difficult list.
Ultimately while I feel that gladiator may have had the better lead actor and tighter script, I can't help but keep revisiting KoH DC. Visually it is one of the most beautiful films in the genre and it reveals different themes to me each time I watch it. Gladiator: while glorious in its execution, is ultimately a little on the shallow end with its revenge plot.
Kingdom of heaven DC is near Lawrence of Arabia for me.
Alexander is a mess but it's incredibly accurate and dynamic in its battle scenes - Troy and 300 are on the campy fun side.
1a) KoH: DC
1b) Gladiator
3) Troy
4) Alexander
5) 300 - this only exists in my memory as memes