One would usually go for the biggest Ah battery where possible. But you also have to look at the discharge currents.
The Red Pole has a 10amp discharge current and 20amp burst.
The Lalela has a 10amp discharge but no info on the burst rate on the 24v one.
I would check what amps the motor is using when operating if its below the 10amp rating then either one will work. I have hardly ever seen any motor go higher than 2-5amp though that can change when the gate/door is heavy or something is stuck.
Both have a 1 year warranty at takealot and the Lalela has more capacity 156Wh vs 86Wh. According to Red Poles website the say 3 year warranty.