Joe Buck has one of the best announcer/radio voices in broadcasting. Some of the most exciting and historic baseball games have been called by him, and to me, he's better at small-ball than he is football.
The thing about his play by play, is his ability to create a heightened intensity through the use of the pauses between sentences during key moments in the action. The way he simply stops talking between "moments", makes the visual camera shot do the talking. His timing and ability to make the action seem more intense is the reason he's a Emmy winner, and a directors' dream to work with. When Joe Buck calls a game, its a big game.
Regarding Aikman, he represents a purity and "good old boy-ism" in the booth. By exhibiting a sound and thorough knowledge of the game that can be trusted, he's believable and tactful. He's one of the few that have never been part of a custody battle or been arrested for DUI. His perspectives are carefully-contrived and his delivery smooth and on-cue.
Announcer wise, I'm good with these guys calling my football game.