I am no welder for the most part, but consider the application. 4130 is an oil hardening material. As long as it is allowed to air cool, it should return the its base condition. If the part required heat treating and you wanted consistent properties throughout the weld and part, then by all means, use the base material that will respond in like fashion to the heat treat process.
As with many things, you cannot have something for nothing in terms of material physics. As the ultimate tensile goes up, the ductility or ability to deform under sustained stress and fatigue goes down. The balance should be with modes of failure given what could result. It isn't so bad with things show signs at the start of a failing joint. High strength-Low ductility may not give you that chance if\until it just snaps at the least inopportune moment.
You have 2 options with no heat treat, so.....which is more economical or readily available?