Oktoberfest - Light or Dark Munich?

Making this today and putting together my grain bill, but not sure if I should use 5lbs of light or dark Munich grain.

German Oktoberfest - BIAB

6lbs German Vienna
5lbs German Munich Malt

60 min 1 ½ German Hallertau
20 min ½ German Hallertau
10 min ½ Tettnang

Saflager 34/70 (Weihenstephan)
10 min 1 tsp Irish Moss

From Weyermann? I really like their lighter Munich.

Very similar to my first oktoberfest I did last year. 80:20 Vienna to Dark Munich. Single decoction with a 40 minute boil of 1/3rd mash. Lagered in March until September...great malty beer! If you aren't up for decoction, you can try a single infusion mash of 150-152, perhaps. With your grain bill, it might end up low on conversion so perhaps a little pilsner malt (for enzymes) may help or you could extend mash time.