Loadui pro or loadui NG pro, which is a proper performance tool?

Hi,

I am investigating for performance tool and just wondering which of the above is a more robust performance tool. We need a tool which we can do some exploratory performance test testing as well and in tune for our future growth.

Ready API Loadui seems to be good tool but not sure how it stands upto loadui pro and also we need to run long test upto 72 hours, so stability is very important concern.

Is there someone from slaes  I can talk to?

Kind regards

Rj