Arrow and broadhead recommendations

Going to shoot Easton fmjs 340 spine 11.3 gpi shaft length is between 30 to 31 inches bow set to 70lbs. Would a 125 broadhead be a better choice for whitetail more so than a 100 broadhead. Want to build arrows this year but I’m just lost in it and need some good advice. Right now I’m comfortable shooting out to 60 yards. Last year I shot 100 but would like a heavier/quieter setup this year. Trying to decide between a magnus stinger buzzcut or nap spitfires

 

All advice is appreciated

 

Never trust a fart after taco Bell

 

I honestly think it matters little between a 100 or 125. With that arrow you're going to be in the ballpark of 480 grains even with a 100 grain head. That should smoke through both sides (depending on type of head somewhat) of everything except maybe a double shoulder hit.
The only considerations I can think of are:
If you add a bunch of tip weight a 125 may put it closer to the edge of being underspined.
A 100 will be a bit faster, but 25 grains is very slight.
A 125 will be slightly quieter.
A 125 will have more momentum, but again only 25 grains.
A 125 will slightly improve the FOC percentage.
A 125 will have more planning surface (more so with fixed) and will show tuning problems sooner than a 100...if there are any.
One other consideration is if you have one or the other, or both, on hand. If I had one of them but would have to buy the other, then I'd just go with which ever I had.

 

im guessing maybe a 300 spine with a 125 would be suffice... last year i used a 340 with a 100gr spitfire and at 20 yards it blew through the deer. double lung and top of the heart. ive always been a magnus fixed blade fan but man that spitfire did work!

 

I ended up up buying 300 spine Easton fmjs with 125gr nap spitfires.

 

I shoot Wasp 100 grain on a total 513 grain arrow. I like Wasp for their tolerances mostly, each broadhead is within half a grain, which makes practice and tuning much easier. My Hammer SSTs shoot great, but I insert tune, bareshaft and nock tune, then fletch from the ground up. If you do not want to do any of that, then ask your local bow shop if they have used ones you can shoot. If that is not a possibility, then it is trail by fire. Find what works best with you setup and go have fun.