The problem with the DRL is that the project hasn't even been defined yet, its hard to support a project that at minimum is still 12 years away from opening.
Chow's bus service pledge is one that is very important, there is so much more to a transit service than fancy new train lines. Under the current administration this has been thrown out the window with operating and general capital costs being slashed while the fancy new transit lines get argued to death. "TTC - Take the Car" is a line not so much because we lack a certain subway to Scarborough, or an LRT to Humber College, but rather because on a bus line that is scheduled to have 10 minute frequencies you get 3 buses that come in a row every 30 minutes. Its because even if those buses were to come as scheduled, they would be jammed full and completely uncomfortable simply because crowding standards are too high in a way to "save money". Its because bus routes run every hour after a certain time, because they are too infrequent outside of rush hour. Believe it or not, if you actually make an effort to provide high quality bus service, people use it. the TTC is limited to doing the absolute minimum however, and Toronto is left hurting because of that. Its a problem where people hate buses and streetcars as they are badly managed, and want something else. Little do they realize that a lot of their issues can simply be fixed by spending a bit more money on some more buses, shortening bus lifecycles, improved line management techniques (how about running lines "express" to fix time differences instead of short turning them?), and better communications technologies. Its not rocket science, and Chow's promise on improved bus service is a great start and leads me to believe that she will be open to further general operations improvements to the TTC that can make a difference before the end of her first term, not 12 years from now.
Tory's proposal has essentially become "do nothing" at this point as the province is willing to pay for it now apparently. He also seemed to have missed the Downtown Rapid Transit Expansion study which explicitly ruled out the type of line he is proposing as it doesn't work nearly as well as the DRL at achieving its goal.
If you want good transit in this city, I think Chow is your best bet. Soknacki is probably just as good, but unfortunately doesn't have a chance in hell in winning.
