if your primary purpose for running Phat Han is to beat Whisper then VI is the clear winner (and to be honest if your running Phat Han in a tournament this is most likely the case)
the main reason is cost, VI cost 1 point and also means you don't have to spend points on initiative bid, maxing out to 100 point lists.
Now to get the same effect with predator, your likely going to have to cough 2 maybe even 3 points on an initiative bid to outbid whisper pilots, on top of the additional cost of predator itself.
This basically means that Predator is going to "cost" you 5-6 points, which I think is too many, I would rather have VI and have another 4-5 points to spend on upgrades or bumping up another pilot etc.