Project Planning vs Project Management?

Hello Guys,

We would like to ask your help, what our customer should use.

They can't decide now, 

Project Planning is quick, just drop down a project and drop into th tasks, but in Project Planning App the user can't use filters and can't see the list by the assignees (or can they filter somehow this project by the assignees?)

Project Management App can show the list by the assignees in Gantt chart with filters, but it is a too complex platfom for the daily work and they would like to use a quick method like project planning.

We don't know why Project Planning project and Project Management Projects are not compatible with each other, but it could solved this problem.

Could you recommend something?

Thanks in advance and regards,

Zoltan BIRO