score:1
Due to a lack of answer here I can tell you what I figured out. Apparently it is better to stay in Malang rather than Surabaya.
From there I saw that there is a Bromo & Ijen tour (together). From Malang, Batu Secret Zoo is also much closer.
Upvote:3
I've been to Mount Bromo and Ijen crater many times. If you want to get a good view and landscape then better you go to Mount Bromo, take the picture on Penanjakan viewpoint, you'll get the picture:
But if you want to see the big crater with toxic water and sulfur (and blue fire at night) with the chance of getting closer to the crater, then better to choose Ijen. Here's Ijen crater,
Have a good trip then.