I'm very sure you are poisoned now.
I had the same experience. Was driving Kenari previously.
Hand itchy went to test drive a Polo, man that little puny car can corner at 170kmph and still rock solid, totally planted.

Over the next few days, I test drove Golf TSI and again Polo TSI.

Now happily driving one VW

Hahaha... erm.. Kinda big jump
Have you tested Polo?
Go try.

Personally, pickup wise, I feel Polo is more responsive when you step the pedal, and Golf is slightly slower (this could be less than a second) and perhaps this is due to Golf being slightly heavier.

Figure wise, Golf did 0-100 in 8 seconds while Polo did it in 9 second plus.
Hence, the feeling above is just feel rather than actual fact.

However, there's few things about Golf that makes you should consider it instead of Polo.
Xenon Headlights, auto rain sensor, auto headlights, bigger boot, rear air conditioning, automated side mirror and auto folding.

Go compare the brochure side by side and suddenly you will realize Polo features is slightly less, although that is something you ought to live with, as the price difference is a lot.

I won't ask you to pick which one, but I'll ask you consider finance and ask yourself what do you want!
Go test it both again

Edit: Oh ya, Golf has a front parking sensor and Polo doesn't
I can estimate but still I would prefer some sensor to help me to maximize the space in front and behind the car to the max, rather than keep asking myself, eh can go forward more or not?