For me, the RF Gen is an 'under the bench, haul out as needed' item. That 8662A is quite a beast to haul out on occasion, one of the reasons I've never been tempted to keep one. Also, you might want to consider the modulation capabilities of each if you anticipate needing that capability. Extensive manual reading is indicated. I haven't seen the Marconi 2024 myself, but the 8662A is a well-made monster with a very clean, precise signal output.