According to rule 12 we can't ascertain what's 'best' for you... think and decide...
On doom9 there are no miracles... if you even think about re-encoding, you have a loss of quality... we live in a very lossy kind of movie experience... 1 hour of uncompressed 'raw' 1080p HD material takes 560 GB to store... after that it's a long line of compromises to achieve a satisfactory result.
My computer science professor used to say that 'Life is about priorities'... in your case, crop or downsize... else, leave as-is.
Pascal