Hi friend!
I think it really depends on the amount of soil you're dealing with and the time you have on hand for sifting.
I use a set in stainless from amazon that does the job perfectly.
If I ever have to invest it would be in a Mirai style sifting colum or set from Mazakuni (very expensive)
I havent find the need yet to change my actual set, at 40$ Amazon would be the place for quality/price