Rogain Foam Vs Kirkland Foam. Which One Is Better?

[WonBin Lee]

Why is the Kirkland Foam cheaper than Rogain Foam?
The price' Gap is very wide.
Is there any advance ingredients with Rogian Foam that is not included in Kirkland Foam? Or just because the Rogian Foam is the 'Origin'?
Is there side effect with Kirkland Foam?