That's a good question, but unfortunately we can't discuss it here without being accused of "shilling." 
Because you don't have an answer more likely. Monero has yet to solve this. Another thing Monero has yet to implement is tree pruning, which will be very important for dealing with blockchain size
BTW for anybody who doesn't know, I feel the need to point this out. Monero was created for the sole purpose of implementing Cryptonote. So when somebody says "monero like" ring signatures what they're really talking about is implementing Cryptonote. Monero has nothing to do with it.