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I am really surprised that nobody suggested a 50 mm objective to gather more light at dusk. JMHO
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Scopes don't "gather" light. They transmit light through the scope and there are several factors to consider. The scopes magnification combined with front objective size determine the diameter of a beam of light that comes out the rear and into the eyes of the shooter. A 40mm objective at 8X will allow the same diameter beam of light through as a 50mm Scope set at 10X. Below 8X both let more light through than the human eye can use.
If looking for a scope with only 8x or 9X on the top end a 50mm scope offers no advantage. And for any magnification above 10X you need to go a lot bigger than 50mm.
With most of the OP's choices topping out at 5X or 6x anything bigger than a 30-36mm lense is a waste. The 2.5-8X36 scope will be somewhat handicapped at 8X, but will allow the same amount of light at 7X with a 36mm objective as a 10X scope with a 50mm lense.
A 50mm scope is only an advantage when set on 10X, and only for 2-3 minutes in the morning and evening.