I've not tried Mundorf silver/oil, but I use silver/gold in phono stage & line stage components-- particularly in higher values where V-Caps become cost-prohibitive for me. The Silver/Gold are clean and neutral, and IME do not lack for bass as some have commented. Mundorf wrote to me that Silver/oil it tilted up in midrange and bass and that Silver/Gold is more faithful to the music "as recorded." Also, if the caps are to be used in a hot tube amp chassis, consider that the silver/gold are rated to a much higher temperature.
Whatever you decide, allow several hundred hours for the caps to relax and sound natural.