Soft top shortboard length?

Hi guys,
I'm new to this forum so forgive me if a similar question has already been asked.
I am looking for a short soft board to have some fun and not worry to much about the board. Throw it in the back of my car and go for a surf if I happen to see any waves
In this segment there are a lot of options.. But I don't really know which length would be the best choice. There isn't a surf shop near my hometown so I can't really go and compare.. Since softboards do have a lot of volume there a some really small boards like a 4'8 or 4'6 beater. Most of the time the waves aren't perfect were I tend to surf.. pretty low.. I already own a 9' longboard so that can paddle into almost anything. I saw this board: "Softech Flash" this board has a pretty decent volume (34L or 37L) there is a 5'0 version and a 5'7 version. But I don't know if 5'0 is too short for me. I am 180cm and 75kg. I have surfed for 5 years now. And have experience on a 6'2 fish board (I don't own that board anymore)
What would be more fun to surf in a wider variety of conditions? something more in the 5'6 - 6'0 range or 5'0 - 4'6 range.
I'm new to this forum so forgive me if a similar question has already been asked.

I am looking for a short soft board to have some fun and not worry to much about the board. Throw it in the back of my car and go for a surf if I happen to see any waves

What would be more fun to surf in a wider variety of conditions? something more in the 5'6 - 6'0 range or 5'0 - 4'6 range.