As always, you get good advice, but it varies, because people are different.
If I were you, then I would go for the 35mm focal length. This is because in rangefinder photography both the 50mm and the 35mm lens is considered a standard. Most folks have to use both lenses for awhile before they can determine whether they are a 50mm person or a 35mm person or, like me, use the two equally for the majority of their shots. You yourselfe need to make this journey, because it may turn out that you prefer the versatility and view of the 35mm lens to the exclusion of the 50mm lens. In other words, the 35mm lens becomes your standard and you get rid of the 50mm lens. A lot of folks do that. But the only way to know is to use the two side by side for awhile.
I frankly like having both the 35mm and the 50mm focal lengths. Probably my best shots come with the 50mm lens, but the 35mm lens is so versatile. If I'm limited to one camera and one lens -- which is often the case when I'm traveling where weight is an issue -- then it is always the 35mm lens. And given it's extra depth of field, the 35mm lens is probably faster focusing.
If you're only interested in creating a versatile outfit, then the 28mm lens is an option for that wideangle view.
What are your typical subjects? If it's people, then the 35mm lens would probably be a better choice. But if its architecture or landscape, then maybe the the 28mm lens is the way to go.
And finally do you wear glasses. If you wear glasses and have the standard viewfinder, then the 28mm frame lines will be very difficult to use.