What would you do?

A friend of mine (former coworker) used to work at the same law firm as me. It’s an area of law he wasn’t initially interested in, but was fresh out of law school and it seemed like a good enough offer and it turned out to be a good fit. He is extremely smart and caught on to things quickly. The company also has an incredible training program which made that process even smoother. Him and I were paired up as a paralegal/attorney team and we worked together for three years. In that time he became one of my closest friend (if not the closest) and we worked seamlessly together. About a month ago he got an offer from an intellectual property firm that was about 50k more than he was making at my current firm. Keep in mind that was his starting salary – 50k more than what he was making after 3 years here. He also had been interested in IP to begin with, and interned at this firm during law school but there was not a position available for him when he graduated. He decided to take the offer, as it seemed like a no brainer. It wasn’t easy for him to leave. My current firm is a really unique workplace, especially for a law firm. They truly care about their employees and the work/life balance is unmatched. When he put in his 2 weeks, they were extremely understanding and they told him the door was always open if he ended up not liking things at his new job. Fast forward about a month, he’s complained nearly every single day about how miserable this new place is. He doesn’t get more than 10 minutes for lunch, he’s expected to work until 9 every night, there is no training program, no socializing, no mentoring, he just is expected to figure everything out on his own. It’s been a polar opposite experience from the one he had at my firm. Today, my current boss (his former boss) called him and asked how things were going, offered to take him to lunch (which my friend declined as he doesn’t get much time for lunch lol) and ultimately offered him about 25k less than he’s making right now (25k more than he was making prior to leaving) to come back. Obviously this number can be negotiated. My friend said he would think about it. He told me he wants to give it more time at this new job before he decides to give up. Which I totally understand, I guess I’m just asking if you think it’s more important to be happy or to make more money. He wants a family in the future and to get married to his current girlfriend at some point so I see how the money is extremely important. But at my current firm there’s so much room for growth, he was on the partner track, he was really happy there, had friends and a social life, got to leave work at 5 and not be bothered after hours, was really great at what he did, had good relationships with clients and staff, and they are ready to have him back with no problem. What would you do?