I would advise good digital with at least 4 megapixes and truly good zoom. We had use 35-m for years. Three years ago we went in realy spectacular road trip. I used only my digital. My husband use regular 35-m. I got over 200 pictures of "national geaqographic" quality. Of 5 36 pictures films, my husband got around 40 pictures worfy to keep. We never used 35-m since that time. With digital, you not limited with number of shots. If you don't like it, just delite it and use the space again. And if picture is not perfect, but valuble, there is alway a photoshop.
Look my profile. I put few picture I took with digital.