Navionics Platinum Hot Maps vs Navionics Plus

[ccm]

I have been searching for the best mapping card for my new Humminbird 959 ci hd di and have narrowed my search down to either the Navionics Platinum Hot Maps or the Navionics Plus. I fish mostly the coastal marshes (no offshore) in Louisiana plus some inland lakes in the north western part of the state.

Would appreciate input and advice on these two cards and I would also appreciate suggestions for the best place to buy my card.

Thanks in advance for your help.

Charlie