I think the randomized portal reward is a mess because at the end of the day, we'll always choose the easiest portal; rendering the other portals straight up annoying and unnecessary.
There should be an incentive on choosing harder portals like an increased currency reward.
The portal reward should be fixed: Namek, Edge of Heaven, and Land of the Gods.
Namek -> 0% more Flowers
EoH -> 10% more Flowers
LotG -> 25% more Flowers
with the secret portal appearing below (same chance of getting)