G5 stryker montecs vs thunderhead xp

[bugs n bones]

I know there both good broadheads , which is more accurate or likely to shoot the same as my fieldpoints?

[Alaskan]

I have had amazing results with G5's. They also have a practice broad head (same weight) which you can use to see how the "hunting" broad head will fly with your setup.

[MtnMuley]

It isn't the broadhead that determines accuracy.

[GoPlayOutside]

I used to use the Thunderheads (because I could get them cheaper), and they worked great.  I had full pass thru's, I had bone hits, not great shots, etc.  They seemed to hold up and cut well. 
For some reason years ago, I switched to Muzzy....probably just because of the hype and advertising.  (I had no reason to switch).

I will probably go back to Thunderheads when I run out of Muzzy's.

[RadSav]

All three heads you mention are virtually the same in regards to flight.  If any has an advantage it would be the Stryker as it's vents are smaller.  All broadheads fly like field points if they have enough fletching and proper FOC so I wouldn't be worrying about that much.  Stryker is MUCH sharper than the other two and uses better steel.