You try to get the comparison between the two companies in short and long terms with respects to, say, pay, benefits, insurance, long term employment, leave cycle, family status, educational assistance, and many others. Also see any potential "to go up the ladder". If you are experienced with big multi-national companies, then you may compare what was before and what is now. Even these two companies are in same industy, there will be difference and uniqueness built-in.
Keep in mind that these two companies had a long way back many years of existence either from their parent company or with their present setup. Good luck in your future job.