I would say that it depends not so much on the preference of the person, but on his character. There are impatient people and they want to play games where the result is immediately known. On the contrary, there are people who are prudent and prefer to think and weigh everything well. They are like chess players. And of course, such players are not interested in playing slot machines. And for every character of a person, the online gambling market now offers many options.
So it is extremely difficult to answer the question of this topic, which is posed by OP.
I totally agree with you mate, there are those who care so much about bonuses more than they care about winning a game, and there are other that are really not interested in bonuses but just wanna win.
I am the latter type who doesn't really care about bonuses but care more about winning, after all, my main reason of gambling is to have fun and also make some money in the process, bonus or no bonus to me does not really matter as long as I am comfortable and with the casino's features and games they offer.