Howdy polopo,
Terra Nova-MB and Terra Nova Online both provide the same access to the market via the RealTick Trading Platform. Terra Nova-MB is based out of California while Terra Nova Online is in Chicago and both act as representatives for accounts held with Terra Nova Trading. As for the differences for those who trade through both, they come down to the people you deal with on a daily basis and, to an extent, the promotional deals each offer. Terra Nova Online currently offers a refer a friend promotion in which both parties receive a calendar month of trades at a commission rate of $7.50 and a Tuition Reimbursement Offer in which we will pay for your training course at MarketWise Trading School. If you are looking into trading with a broker that offer's RealTick, TNO and TN-MB are two of the best. My suggestion would be to check out our websites, call with any questions you have, and then decide who you feel you will work with best.
No matter your choice, good luck on your trading!
Michael Garvey
Client Services
Terra Nova Online