What do you prefer 100% salary every month or a lower fixed salary with bonus for every deal you achieve?

i would assume this question to be about style and not preference.

depending on the style ,skills,motivations and exposure of the person to the sales field comes rewards.

so ,your style and not prefrence will lead you to your desired situation and position.

I would prefer the second option . Lower fixed salary + Bonus as this incetive system can be linked to my efforts . More efforts more incentive. 

It acts as a motivational compensation system.  (other situations being favourable ) 

Now days markets are competitive and everyone wants to hire a best and smart sales person in their Sales force team so i guess people even negotiate a fixed salary plus attractive incentives and if the target is acheived (yearly) there will be extra bonus apart from employee bonus to permanent employees which is given every year .

I heard in Dubai a Sales Manager achieved target and he got hummer as his Bonus so if such lucrative offers are given people will work hard to achieve their targets . In Insurance fields salary is fixed and bonus are high or even in mass selling campaigns like education Industry if you make100 students join a Insitution you get bulk incentives. So it depends totally what you are marketing and selling

100 percent salary

this is a very personal and quite subjective thing to consider. However, I'd go for the second option, knowing i am extremely proactive and competitive 

i prefer a brut salary for more care and trans perancy

It depends on how big your bonus could get. However, If I had to choose, I would say100% salary since this could be a valid investment towards your end of service.

If you are in well reputed company, go for fixed+bonus and if not go for high salary.

You should not waste your salary in the growth phase of the company. Usually, company owners or partners they take that risk, but not the employees.