OpenSSL nowadays doesn't have the issues anymore it had back in 2015 and significantly more Contributors watching and improving it. LibreSSL usually lacks behind in terms of supported algorithms and doesn't support the same API. Libs like Qt dropping support for OpenSSL 1.0 makes it significantly harder to maintain a (correct) patchset for LibreSSL support.

OpenSSL Pros

• Not that many (potentially wrong) patches needed, proper upstream support for nearly ever lib/program
• Potentially faster on non x86_64 platforms
• Access to newer Algorithms earlier
• No ABI breakage every 6 month

LibreSSL Pros

• Potentially safer by default (?)