Primary opions for best legendary to max out

So im looking for yall opinions. Im not rich(etheric light is what this is on) so i want to use the etheric light to max either a scout or an auto. I have the mida (maxxed out thats my main tool)but for those time where i need to leave an exotic slot open i want a good backup. I have patience and time for my secondary. Chain of orbics. Also a maxxed truth. And working on the ghally. So im covered to my liking for my heavy slot. So who has maxxed out a legendary primary scout or auto?? What should i try to get and have as my backup.. ?? Thanks in advance for the info.