I'm 5'9 with a slim build. I have 3 neutral 35's (am about to add another in a very bright color), and 3 30's (2 neutrals and a bright). Whenever I see photos of myself with the 35 my eyes are drawn to the bag (and the size), yet with the 30 it seems proportional. I don't see the same when I look at others. Plus the 35 is heavy, and if I've got the room I'll fill it up! I see having both for different purposes. Oddly, I tend to take the 30's for travel, since I can put them in a larger tote (for the plane) yet they are lighter for walking around/shopping etc. I use my 35's almost exclusively for work, and will probably adhere to a one-in, one-out rule in that size.
I see room for both sizes in your wardrobe, if you can swing it!
Photos for reference..
I see room for both sizes in your wardrobe, if you can swing it!
Photos for reference..