I don't know which one works the best, but I do know which one works the worst definitely.

Stay away from blockchain.info wallet !!!

It seems blockchain.info has shortened their pruning time. Hence, Tx affected by malleability are getting cleared from their nodes sooner and hence users are being able to reuse those UTXO faster.

Coinbase does not need to pay anything fro their internal settlement. But, Coinbase is paying Tx fee even when the Tx is going out of Coinbase too?

First of all, UTXO generally stands for Unspent tx(transaction) Outputs, and you must spend an unspent transaction output in order to create a valid transaction.

Based on the title of this thread, I will assume that you are looking for a wallet that will not attempt to spend an unconfirmed output from a transaction that has not yet confirmed, and will answer accordingly.

First of all, you should be sure not to reuse addresses, and doing this will make it much easier to avoid spending an unconfirmed output.

Once you are following the above rule, you will want to find a wallet that allows for coin control. I would personally recommend using electrum as it is a lightweight client (meaning it takes up very little resources), that will generally be able to validate when you have received a transaction, and is deterministic (so all you need to recover your private key is your recovery seed). You can use the coin control features with electrum (both "freeze" addresses, and "send from") to spend only inputs that are confirmed. You can "freeze" addresses when you do not wish to spend BTC "in" those addresses, and you can "send from" addresses whose inputs have sufficient confirmations (you can even select multiple addresses to "send from").

If you are already running a full node locally (or if you are giving immediate credit to people who send you BTC) then you may want to use armory. Using armory will require you to run a full node locally, so any transactions will be fully validated which requires an incremental lesser amount of trust then using a light weight wallet. Armory has similar coin control features that electrum has, although I believe they are titled something different.

I think miltibit should handle it good because it don't let you spend btc who isn't confirmed. That way you will not have problem with double spend like those who blockchain give you when you spend unconfirmed btc and one of the inputs get mutated by the malleability bug.

The best wallet selector website I've found yet, check it out -> https://bitcoin.org/en/choose-your-wallet

These are not all the wallets available, but it's a good start.  Good luck!

Just use the Core and don't hurry, so you can afford several confirmations before spending, and you will be safe

using MyCelium and no problems.

No probs with mycelium here either.

As long as you stick to one of the main popular wallets I guess there won't be any problem. Just don't trust unconfirmed transactions and check balance with multiple block explorers that is not bc. I recommend btc.blockr.io



Yeah, but at the moment, blockchain.info seems to have fixed it. No more negative or huge balances.