User blog comment:Rakanishu2199/Best win rate - Blue or Purple team ?/@comment-4636093-20130112134416

Blue has a noticable advantage.

Blue team goes for baron, purple team is trying to contest it. From around the front of their base where can they go to get to baron? The only way is to go via their wraiths, funneling them down one route which Blue team knows they will take.

Purple team goes for baron and blue team tries to contest it. Blue team has 2 equally viable routes to baron, via the curved bush near mid lane or via their blue buff. If they split their team and take both they'll have purple team completely surrounded.

--

While purple team should have the advantage of dragon control going by this logic, in practice both teams can control dragon just as easilly because at earlier points in the game map control isn't as defined due to towers still being up.

---

And then there's the fact that blue team's bot lane have double golems to take whenever they want. Giving them a noticable exp advantage against purple team.

Top lane purple side will take a lot of damage if they try to take the golems because there's only one person.

--

And then there's the support's ease of warding dragon in the earlier parts of the game. If ether team are pushed up, blue's support finds it much easier to sneak over to ward dragon, wheras purple side has a great big wall in the way.