opinion for membership.
buying coins is the same as the old version in the previous year. If finish, you still need to top up again (i will not talk about free coins/ss and privilege).
with version 4.2, they want to differentiate the buyer, it up to the reader to choose either be a normal buyer or membership.
the benefit that we can see so far in term of coins:
1. normal buyer = received coins without bonus coins
2. membership = received coins with bonus coins
price? still the same as previously. (observe for 1st month)
if not mistaken, old version
150 coins + 15 bonus = forgot the price
500 coins + 100 bonus = usd9.99
1000 coins + 250 bonus = usd19.99 and bonus coins/ss for old version expiry 90 days.
same goes with the new version (4.2)
membership coins in 1st month either starting Dec'19 or early this month, they offer 500 coins + 310 bonus/31 days = 10 coins/day = discounts price usd7.99 (actual price is usd9.99). You get another extra 210 bonus to compare to the previous version.
yesterday I saw they offer 250 coins + 150 bonus = usd3.99 (normal price usd4.99)
from my view, its nothing different from the price. The only difference is either you become a normal buyer/membership.
if you don't like the membership, still can cancel it right.
edit: I guess, I speak to early, need to wait for the next month and see the difference again.