First - dont believe everything you read
Second - you can make good money doing either - for people just starting out - tgp galleries are probably the worst way to go unless you have a sizable load of money for a server and bandwidth as to do it right those are things you really need.
Third - whichever you choose to do - it takes hard work and dedication to do it right - you cant just throw things together and use an autosubmitter and expect to get rich - takes lots of time to get recognized as a regular submitter and be accepted every time you submit.
Fourth - Dont believe everything you read