Should I go 5/4 or 4/3?

Finally replacing my wetsuit. Was a vissla 7 seas 4/3. used it in winters on vancouver island and only ever got cold fingers or toes, body has been good. Debating whether I should go up to 5/4 or just stick with another 4/3. Looking at the Xcel Comp+. Anyone tried them and can share what the warmth was like?