I think when it comes to this one its each to there own to be fair.
However i use different products for different jobs..

For exterior plastics i use autoglym bumper care (many don't get on with it but i've never had a problem)

For engine bay plastics Aerospace 303

Interior trim Poorboys Natural look trim dressing

Wheel arch liners Meguiars All season dressing.

but as said its each to there own and you will always find someone that says one is better than another