Should i join this MNC but with very less demanding tech stack in India. Progress 4GL over MERN ??

Hello Everyone, I am from tier 3 college, 2024 batch, I am interning at a startup with 25k/m pay as a Frontend Developer(MERN). but not sure whether I will be offered a full-time position here. I also got one full-time offer as a "Graduate Engineer Trainee" Role at a company named QAD Inc. which pays around 5-6lpa and after 6 months of probation period I will be transitioned to an "Associate Software Developer" role (that HR said would be performance-based). Now after some research and asking myself during the Managerial round, i found out this company uses Progress 4GL technology which is used to build business software in EU countries, which doesn't seem to be promising technology as a career and is very old technology. I don't want to be limited to my current tech stack but I am having a hard time deciding whether I should go for this tech stack which does not seem to be much in demand.

Since there is no duration mentioned on my internship offer letter, HR told me it will be a minimum of 3 months and I will be completing that period by next month and my joining date on this "Offered" Company is after next month. I will ask HR for full-time conversion by next week but I want to know if should I consider this offer as in the worst case or if should I continue to search jobs with Demanding tech stacks.

Hope you guys help me out. Thanks for reading out :)