One advantage of the Tessars, is that they are usually Bay I, and the filters & accessories are very reasonable. The Planar is Bay II, and being larger physically, the same accessories are not only more expensive, but also harder to find.
I find the bokeh when shot wide open, to be softer with the Tessar, (more natural), but then I rarely use any lens wide open, except for portraits/head shots (etc). For landscapes I prefer a Tessar. Architectural, I use the Planar.
You'd just need to shoot each, and then decide which YOU prefer, based on your style of shooting. Everyone is different. Some people are loyal to certain car names, or brands, the same holds true for lenses.
I recently picked up a Rollei 35 Rangefinder made in Germany in 1969. It has the desirable Tessar collapsable lens, which produces amazing images. Still shooting my 2nd roll through it (color this time, in New England last month). I doubt it will disappoint at all.