I feel it would be a nice addition to see the regional routes for Berlin and the faster ICE T services
Berlin-Leipzig in all it´s glory has been made for TSC... including a couple of other add-ons of S-Bahn routes in Berlin. Bahnjahn seems to be the only developer who touches Berlin and he is one the last left to make TSC routes and seem to have no plans to make the move to TSW. If you want anything Berlin, you need to get into TSC. Just my two cents.
About 190km and many stations, some of which are large. A mammoth job. Never done anything like this in 7 years of TSW. Translated: I would also be happy with Dresden-Leipzig (via Riesa), about 120km and fewer stations. Anyway, as they told you above, with a PC you can play both on TSC.