Is people tend to watch normal playthrough or "cheat/hack/mod" playthrough?
This depends on which audience you aiming at. Normal playthroughs are watched by people who want to experience the whole game. This could be for multiple reasons. Such as not owning the console themself, not having the money to buy the game, not being good at gaming, etc. The aim or a normal playthrough is to show the complete game and (maybe) share your first impressions and/or opinions.
A cheat/hack/mod playthrough has a different purpose and thus a different target audience. These playthroughs don't focus on the gameplay or the story line, but often pose a challenge. To do the game super fast, giving yourself a handycap, or to show the game in a different light (mod). These playthroughs often attract an audience who either already played the game or who have already seen normal playthroughs and want to have a different experience.
So, whatever you pick is your decision. There are a ton of normal playthroughs out there and it is a highly competitive area. Playing a mod/hack/cheat version will narrow down your potential audience, but will also make your video much more unique and thus more competitive.
