Train or bus from London to Bath?

The National Express coach from London Victoria takes over 3 hours and if you purchase on-line you should pick up a fare around 8 GBP (15 $US)

The train from London Paddington takes 90 minutes, the cheapest advance purchase fare being 17 GBP with walk up fares often about 47 GBP.

Both offer similar scenery, both are reasonably comfortable.
Whats best? depends on how you value your time.

Thanks. I like 90 minutes much more than 3 hours