always go oil if you're building or replacing an original oil.
if ya go lytic,
don't buy into the "reforming" crap. You cant reform caps that have no electrolyte in them because it dried out 25 years ago. Always buy new (
NOT NOS) replacements, and increase the voltage rating per cap by about 15 to 20%. I always use 500VDC to replace 450 volt.
use the best 2% tolerance EQ resistors money can buy in a lytic cap string and hand match resistors with a vom for the closest values possible. To replace 2 watt carbons, use 2% 3 to 5 watt metal films. Overbuild by design and you'll never have any trouble.
one last thing: always use a blast shield around a lytic cap string. this will keep he rest of your rig clean and free of billions of tiny little cap fragments in case one does blow up.