I'm pretty sure it's the same engine. The advantages to pro are the automated trading (autospread / autotrader) and connectivity to all TT gateways. autospreader alone is worth any price you'd pay for the upgrade. I haven't run them side by side but it seem illogical to have a different engine for both...
I believe it's the same engine too. My point is more of this........I use Ninja with TT data because right now I pike, albeit sometimes as many as 20 RT's a day. If I were doing 20 RT's per trade I wouldn't mess with anything but TT Pro. I believe anything with TT data is good.
I don't understand your terminology. What do you mean 'I pike' and I understand 20 RT per day but 20 RT per trade? Do you mean 20 RT per day and 20 cars per day?