I would advise you to grab the GovTech job as fast as you possibly can. The reason being that: They are paying very well compared to the other two companies you listed. Also, you can easily work from home, which to me is an advantage.
I am a
primary school teacher, and I am currently working from home because of the covid-19, and I can tell you, I am enjoying every bit of it.
Just go with the GovTech. That's my humble opinion.