I use the train for commuting to work, and for leisure trips at the weekend.
I don't drive (by choice), but recently had heated arguments with a colleague when we were both relocated from our office 'in the sticks' to one that is a 5-minute walk from a station served by both tube and Overground services.
In the road vs rail debate, cost is not the main issue, as our employer pays generous relocation costs that mean our extra expenses (compared to our previous journeys) are more than covered.
My colleague's sole reason for choosing to go by car was on the basis of a shorter journey time. When traffic is light, he invariably gets home quicker than I do. But my reasons for choosing the train are
1. The connections mean I can be fairly certain of what time I will get home, to within +/- 5 minutes (if he hits bad traffic, there is potential for a doubling or worse of his journey time)
2. I can relax, watch catch-up TV on a tablet, or read a book... things he can't do when driving
3. If I'm really tired, I can have a little nap... something he definitely can't do when driving !!!
The main argument in favour of the train, however, is that the work-bound journey occurs at a time of day when road traffic conditions can vary enormously around the London area in which our new office is situated. I know exactly what time I need to set off, to be at work with 10 minutes to spare, for a pre-work cup of coffee. I know that the journey will take me 62 minutes, end-to-end.
My colleague, however, has to factor-in the distinct possibility of bad traffic, when deciding what time to leave for work. In the first few weeks, he would typically leave home 45 minutes before work, drive in very stressful conditions, and constantly be late arriving. After a ticking-off, and a particularly bad delay on the roads when a collision (in which he was not involved) resulted in a 90-minute journey, he now sets off at least 70 minutes before his start time.
Most days, of course, he arrives at work way earlier than he needs to, and grumbles about 'hanging around, waiting to start work'. But road traffic conditions are such that he HAS to give himself that 'time cushion'.
For me, the train is preferable, because it is not stressful. I value the relaxed mode of travel more than the time 'saving' of a car journey that is in theory faster, but in reality, involves high levels of alertness at a time of the evening when one should be looking to be unwinding, not increasing one's stress levels !