One site has been demonstrably transparent, the other hasn't.
Transparent? In what way?
How many bitcoins does Coinbase control?
How do they determine which transactions to cancel due to "high risk"?
Are they engaging in "fractional reserve"? How would you know?
I'm done playing with trolls.
LOL. Clearly one of us has facts and logic on our side, and the other is frustrated that their opinions don't hold water.
The most important rule to remember when it comes to bitcoins is:
"
If you don't have exclusive control of the private key associated with a bitcoin address, then you don't have the bitcoins that are associated with that address."
There is only one web based wallet that I know of where you maintain exclusive control of your bitcoins.
Here's a hint...
Coinbase is
NOT that web based wallet.
Any time you send your bitcoins to an address where you don't have exclusive control of the private keys (such as MtGox, CoinBase, BitStamp, BTC-E, localbitcoins, etc),
you are making a donation to whoever has control of those private keys.
The bitcoins immediately belong to them and not to you. They are no longer "your" bitcoins. In return, most of the people who run these websites will offer you a promise that they will send an equal amount of
their bitcoins wherever you ask them to whenever you ask them to. You need to decide if you trust them to deliver on such a promise, keeping in mind the possibilities that they could have security flaws, could find their assets seized by government agencies, could be tempted to keep the bitcoins for themselves, and a variety of other situations that could cause them to fail to live up to the promise provided.