This is just a thought, and I am not certain so hopefully other people will respond. But, generally speaking when forming a future conditional you can use "will be" when "if" or "unless" are the conditions, and you can use "would be" when "if" or "what if" are the conditions. Since both can be used with "if" clauses this makes this a tough and tricky question, but the next determinate is the tense of the verb in the conditional statement.
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.