Which mattress would you choose? Pocket Spring or Latex?

Latex without a doubt. Pocket springs are made with thinner gauge wire and do not hold up well over time. I've seen latex mattresses last over 50 years, yes, 50 years. Not to mention how comfortable they are. These can be got for around $1300 if you buy factory direct. The Latex Mattress Company is a great place to look at online.