Pet Simulator 99: VIP vs Last Area, for diamonds
A quick comparison between the VIP area and the latest final area (#67: Polar Express)
Using the same team, enchantments & potions, with a flag placed and then checking diamonds gained after one minute.
In the VIP area, because of the delay of new breakables spawning, I obtained about 2,100 diamonds. (approx 125,000 diamonds per hour).
However in the final area, brekaable spawn much quicker, so the total gains where much higher at around 5,500 in 1 minute (approx 330,000 per hour).
This is obviously greatly dependent on your team power, so it's worth repeating this test yourself, as a weaker team may find they're not breaking the last area breakables quick enough, which may mean the VIP area is the better choice.