[2020] which archaeology collection can be completed first/earliest?

Hi all!

Just hopped back into RS3 again today (weirdly refreshing!) and have begun archaeology, currently at level 43 but really wanting the 100 space soil box, the only step left to get 'assistant' is 'collectors assemble I'. which would be the fastest/earliest one to complete?

If it matters the closest one to completion is Zamorakian I and is 4/9. not sure if it'd simply be faster to go to Zarosian I though?

Thanks in advance!