True. Look at Italian Eritrea vs. English Somaliland. The Italians left a great footprint in terms of development, which the country relies on until today. While in the british colony (or protectorate as some like to call it to feel better about themselves, kkk), they hardly contributed anything development-wise. Or anything worthwhile, to my knowledge.
SL was a garrison for aden meat supply like we all are today for the gulf lol, it was indirect rule cuz they lacked unified sultan so the queen was their monarch united. But aden was far more developed then those mountain apes in the north, no wonder they didn't pursue a union initially untill the 90s and now collapsed again. The north was an ottoman sphere and ottomans simply didn't invest to keep up with the british aden leading to huge economic-human/political capital difference.