For 35mm I usually shoot 400 speed film since if it's too bright and contrasty I'm not often shooting anyway so a slower film is not often my best option for handheld street/documentary rangefinder or SLR shooting. That said if I'm using a faster lens or it's a day that's not too dark 100-125 film are preferred as I like to open up for less DOF when I can. Hate it when due to a 400 speed film and a camera with max 1/250 or 1/500 speeds I'm forced to shoot at f/11 or more. That said with MF cameras I'll often prefer 100-125 speed film if I'm shooting handheld as I often do with my Rolleiflexes but will go 400 when the conditions require. If I'm shooting landscapes or botanicals I'll go to a tripod usually with a MF camera at least and then it's often 25-50 speed films. Luckily I did stash away decent amounts of Plus-X, APX25 and Agfapan 25 in 120 a few years back and go with those for many of my fern, flower or landscape images and always use a tripod.