Yes I have multiple accounts, and I also trade with a a group of traders and we all have different brokers, IB is always the best when it comes to shorts compared to the others. I make 80% of my money shorting so Im well up on who has the best short list, Ive done my homework.
I would have to agree with everyone else that has stated IB as their recommendation... and unless you are shorting large blocks, I wouldnt be too concerned with IB's list given it is pretty deep.
Several other users also say IB has the best short list. TOS was also good before it was bought. Now it seems IB is the best although it is not perfect (Order through TWS is not very convenient). I'll choose IB. Thanks for you guys' help!
IB publishes its short stock availability here. You can click through to a single stock and find out the quantity that can be lent out. http://individuals.interactivebrokers.com/en/index.php?f=shortableStocks&p=shortable