Hi Sumon, I had the same comparison but decided on Hilton in the end. Hmm.. I would find Hilton still carries the "grand" look with a resonable pricing. Well, it's really up to individual preference.
Some thoughts for sharing here?
1) 20 tables x $300 = $6000 additional(are u willing to pay the extra for the desired theme)
2) Not sure if the ballroom for 20 tables is at windsor ballroom? coz when I went there, the reception area is very small.
3) I only attended a dinner at GWP. Not at Hilton yet. I must agree GWP ballroom gives ppl a very romantic feel. Other factors to consider such as hotel suite, environment, perks etc. By any chance if it concerns u, I felt GWP carpark area is very dark and can get scary after dinner. Plus it was raining heavily that day and we noticed some guests drenched when they reached reception.
4) plus point for GWP is pillarless (am I right?) I'm taking the Grand Ballroom @ Hilton so can't comment much for level 24.