[Q] Need help -- Should I Root or OTA update first? topic

hello everyone,

I have a Galaxy S4 sgh-i1337M with Fido in CAanda. I would like to Root and enjoy my phone as it should be.
Before doing anything, I checked for software update on the phone in settings, and there is one that is 100.01 MB. Looking up that size, I think it has something to do with this number (my modem version??):
I337MUMUFNK1 -- which comes up when I search google for an update of that size which is OTA and for my phone.
Samsung and Fido and Google say to call the 'others' as they do not know what this update is for. WTF! Nobody knows what the update is for??
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My phone info:
I am on 4.4.2
SGH-I337M locked to Fido in Canada
BASEBAND: I337MVLUFNE1
KERNEL VERSION: 3.4.0-1529758
DPI@SWDD5823 #1
BUILD: KOT49H.I337MVLUFNE1
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The baseband seems to be what the update will modify??? (ignore this if its dumb)

MY QUESTION:
Should I root the way it is now and disregard the latest update?
Should I update the phone now, as I won't be able to receive OTA updates in the future and then Root? (I know I can always do whatever I want after rooting.....
it would still make sense to do this update now, then root as its just easier that way).

Thank you in advance to everyone who knows the answer to this and responds!