'Best' would be a Molle vest platform, and then adding your choice of pouches
Then you can reconfigure for the day and how you are going to play, developing and changing over time
But that comes at expense
Molle was very hard to get in the UK, but is easier now and is compatible with osprey
You can mix and match proper military grade Molle, Airsoft and paintball specific pouches
Hong Kong sources such as ebairsoft make your money go further
Cheaper than Molle but not flexible is a dedicated combat vest
Have a look around your local army surplus