I have one 6:4:1 bait cast reel with #30lb. braid for top water poppers & twitch baits , a second 7:1:1 bait cast with #15lb AbrazX on it for football jigs and just received an additional 7:1:1 bait cast reel I plan to pair with a 7' MH rod to use for C-Rig  ,  moderate vegetation  flipping of creature baits , craws and jigs .  I'm thinking either #40lb. or #50lb. braid would be the ideal choice  - based on above which size would you choose ? Thanks in advance ...

I'd go with the 50 for the simple fact that it's easier to find and the diameter agrees with baitcasting gear better IMO.

Bluebasser86 : Thanks for the reply , just curious that in the event you want to make longer casts with lures lighter than a C-Rig (in that 3/8th oz. to 1/2 oz. range) that #50lb. braid will still allow you to make a decent length cast ?

50# works for me for just about everything braid and bait casting related.

50lb and I wouldn't think twice about it.  Can do just about anything with that.

i prefer not to use braid most of the time because depending on how your going to fish it when i punch pads i don't like the squeaky sound it makes so i use straight fluro anywhere from 12-17lb test (just my opinion)

I'd go 50 also.  Its one of my favorite sizes in braid.

I'm another vote for 50. It's my favorite "all around" braid strength, if I were forced to only use one pound test this would be it, hands down. Having said that I've also had very good results with 40# on similar powered rods for similar duties. I don't think you can really go wrong either way here. As far as casting distance between the two is concerned I don't think there would be any discernible difference in everyday on the water fishing. Maybe if you were to set up a controlled test the 40 might edge out the 50 by a small margin when comparing max casting distance with a given lure but as I said for normal everyday fishing 50# is great on casting gear.  

Bluebasser86 : Thanks for the reply , just curious that in the event you want to make longer casts with lures lighter than a C-Rig (in that 3/8th oz. to 1/2 oz. range) that #50lb. braid will still allow you to make a decent length cast ?

Im my experience with 50 lb braid, you will have no issues casting a 3/8 oz or 1/2 oz jig. 

Im my experience with 50 lb braid, you will have no issues casting a 3/8 oz or 1/2 oz jig. 

Agreed, and distance isn't going to be an issue on a standard sized baitcaster. 

I appreciate the replies - it appears #50lb. braid would give me a bit more protection should I encounter more "slop" fishing conditions than I anticipated ... Having one reel with #30lb. braid and one with #50lb. braid sounds like a better spread .

I'm throwing in my vote for 50 lb.