I am sure I will get a thousand opinions but what and why?

Are you asking what I use or what I would recommend for you to try?

If it is the former then the answer is expandable because I get great accuracy out of them and with my KE levels I can shoot one of the larger diameter models and get very good tissue damage.

If the latter then that would depend on your setup in my opinion.

Yu need to tell us what set up you are using. Speed and weight of arrow? Also what you are hunting. Deer, elk, moose? I hunt elk and will not use an expandable broadhead again.

I use a fixed BH, main reason is I hunt bear, deer, elk and moose. Another reason is I feel their is less chance of BH failure, b/c no moving parts. Yet one more my results have been positive with fixed heads, so why change???

I agree it depends on your setup and game to which head would be best suited. Give some these fellas that info, many have tried both and tested both...they' ll point you in the right direction!

I have been using mechanicals for the past 4-5 yrs. I hunt deer only and have had good clean kills with them.

I like their accuracy and tune-ablity. I have very little tweeking when changing from field points.

I have tested a few mechanicals and out of 4 packages of different heads I' ve bought, only one package contained heads that were fully functional out of the box. The others needed a good bit of cleaning and even some metal removal before they would open freely. Some I had to disassemble the heads just to get the blades open! You couldn' t pull the things open with pliers. The ones I tested were Rocky Mountain Assassins (2 packs), Rocket Steelheads and NAP Shockwaves. The Shockwaves were the only ones of those I tested that I considered each head in the package to be hunt ready right out of the package.

I messed around with them enough to know mechanicals will do the job IF the hunter does his job and makes sure the blades open freely and are sharp before screwing them onto his arrows and IF he matches the design and cutting diameter of the head to the KE he' s getting out of his bow.

As for what I use, I quit trying to reinvent the wheel and am back to hunting with fixed blade, cut on impact type heads exclusively now. They' ve been working fine for me ever since I made my own broadheads out of old saw blades when I was a kid.

My personal choice is fixed, cut on contact. There are some good mechanicals out there for sure, and if you have enough KE, and your bow is tuned correctly, you should be fine. I just like the fact that I have less of a chance of broadhead failure with fixed.
Also, IMO the most common reason folks go to mechanicals seems to be because they say " fixed blades won' t fly out of my setup" . That is crap. A poorly tuned bow is a poorly tuned bow...period. Switching to a mech head for that reason results in putting a " bandaid" on the problem.
A properly tuned bow should have no problem shooting either. Do this first, then decide on what you want to shoot.

Sorry for posting too little info, I am shooting a martin jaguar bow, 33 in. axle length, at about 65 lbs. 28 inch draw length, I am shooting goldtip 5575 arrows and they are shooting at about 240 fps. I am one of these people who want as little mechanical stuff as I can get but I also want to be accurate. The only thing keeping me from going completely to mechanical is the risk of failure. I also forgot to say that I am hunting deer.

I have figured my KE on goltips website. If I figured everything right it is 47 ft/lbs. As all of you can tell I am fairly new to bowhunting especially the technical side.

I' ve heard different things about both. Supposedely mechanical are better because they fly just like field points, requiring less sighting-in with your broadheads before season starts. However, the killing power of them isn' t as great. Fixed blade broadheads usually have a wider cutting diameter and are much sturdier, making for a better kill chance. However, they fly very different compared to field points and require a lot more sighting-in pre-season. It depends on what you' re willing to sacrafice for what.
Mike,-