If you want an educated opinion ... Here it goes.
Assuming that you are talking about the head on the right...
I do not like this design as it has been used in the past with poor results on hard impacts. The unsupported blade over the ferrule lends itself to fracture/Bending of the main blade. What happens will depend on the steel composition and Rockwell rating of that metal.
There was a model made many years ago that ran .080 blades and what happened when using this head in hard impact testing was that the blade would not give and therefore caused the insert to break the shaft.
Look at it this way... this thing is a cee-saw that has an elephant on the front (via the locking forward portion in the ferrule and the free floating rear) waiting for another elephant to jump on the unmanned portion of that cee-saw. You are going to break or bend the cee-saw once the impact happens.
If something less than another elephant jumps on the end then you will be fine... probably... but do you want to go with an if on a bear?.
Bears shoulders are greater in mass than the biggest Buck in the world. Bear vitals are way up front... unlike a deers. Do you really want to throw a flawed design at something like that.... something which you are paying for?.
The broadhead to the left actually has much better stability on impact than the head on the right... However... It is not perfect either... just better.
I do not advocate barbed heads and especially on Bear.
With all of that said... I would continue to look. I wouldn't use this head myself.
For another reason (I wouldn't use it) is the fact that Bear do not bleed well. The hair and the fat eats blood up fast!. On the off chance I make less than a perfect shot, the guide is the first one going in. I don't think I would feel right sending a guide into the brush with a spotty blood trail and a marginal shot.
I would recommend a stout expandable (proven) or a 4 blade fixed (proven) before I would ever recommend a new guy on the block with a (proven) flawed design.
I know those heads above look really cool but this is some serious stuff (bear hunting) and I would not go into it with anything less than the best head I could find for the job.
Everything rides on this shot and you are paying a lot of money for this shot. _______________________________
O.K.... I have said my piece on that ;D
Moving on
Being from Maine (a place with more Bear than deer) I have had plenty of experience with bear through the adventures of others and guides that I have known. Here is what the best guides recommend that you did not mention.
Send the outfitter a dirty shirt once a week, every week for a month before the hunt. (I am not joking) Socks are good to.
Just wear a cheap dollar store T under your regular shirt and sweat it up. seal it in a zip lock and send it to him.
WHY?...
Bear have great noises and winds shift. If the guide throws your rags at the bait site every week the bear will get used to that smell and will think nothing of it after a month. Now if the wind switches... no problem
Next....
Do you smoke?. If so... send a pack of your brand with the shirts/socks and ask the guide to light one up and puff on it while he dumps the bait. The lowest percentage kill hunters smoke.
WHY?....
Smokers fidget when they don't smoke and bears are not that blind.
Smokers also smoke...even when they are bear hunting. Bears who are used to the smell don't react to it and the smoker is now clam and still... so the bear doesn't see movement.
Bear are super stealthy when they aren't even trying to be. You most likely wont see the bear before it will see you. Trust me... it happens all the time.
Next.....
Bring all weather gear with you. Bear don't care about the rain but you will. Be prepared so you can be comfortable and still in the stand.
Dont bring a thermocell... Bear can smell those. bring a head net for bugs if it is going to be buggy. Practice with it on before your hunt.
Dont use cover scents. If you do the shirt trick, you are your best cover scent. If you dont do the shirt trick then just hope for the wind to stay with you until night comes. Bear will react to anything that is out of the norm.
Dont rush your shot. Most wounds come from someone trying to take the first shot.
The bear is coming in to eat....you will have plenty of time to get the shot. Wait is the best advise of all.
Great information is on bearing down #1 & #2. Two of the best bear hunting video's I have seen for the beginner. I believe they are still being sold and they will be worth the price. Ralph is a great teacher on the subject of bears.
That's off the top of my head.
By the way... bring back pictures!