I can give you some insights that will ease your decision making.
1) .BIZ is a grandfathered 14 years old global TLD.
2) It is one of the top 5 global grandfather TLDs (com/net/org/biz/info)
3) .Biz domain names are already long time used in Eurpoean markets, just one example, shg(,)biz
4) It crossed 300k registrations and the number goes upward every year. That means people are using them, renewing them because they like them.
5) Way undervalued. Certainly and absolutely have big rooms for rise in values. This is very certain.
6) It will just take one news to sharply rise the value. Do you believe me? e.g. what happen if one day Apple, announces their parent company is A.biz? Or some similar news just like Google whose company is abc.xyz? What do you think will happen? How many times in multiples will the value of .biz rises? I expect 10~20.
7) 3~4 letters and numbers .biz domain names are drying out every year. It is on a path of no regrets.
8) Many global companies are using .biz as another good choice in comparison of the too much high price way overvalued .com
9) All 3 chinese premiums letters .biz are long registered
10) 4 numbers .biz have about 20% left.
11) .biz means business. If you want to talk business, go to .biz, it is better suits and fits for semantic meaning.
Others I will let you search and think about it yourself.