I had the best chat ever with this girl. Should I still keep my hope with Aishu or just try with this girl?

Yesterday I posted about this girl who was hesitant at first to chat with me because we never really interacted in school days but she got comfortable and i had the best chat with her compared to any other girls. We both have similar sounding names and she was 2 years my junior in my school days. I remember some of the boys in my class used to tease me as we had similar sounding names. Now she is 20 and I turned 22 just 4 weeks ago. We had been chatting with each other a lot on Instagram sharing about our colleges, hobbies, favorite type of music and almost everything. Her replies aren’t one word or short like the other girls give. Also she goes to an all girls college so there is no competition for me as there are no guys in her college. I still didn't write anything flirty to her or even compliment her. But I really want Aishu too who was my childhood friend when we were in elementary school and she is 21 and only 5-6 months younger than me but we barely chat and she doesn't reply to my last message for a week or so. Can I still keep my hope on Aishu or is this other girl is better for me?