Colombo to Kandy — bus or train better right now? Any issues with either?

Both are running fine this week. Trains have been reasonably on time, buses are frequent and reliable. The train is more comfortable and scenic if you can get a seat. Buses are cheaper and more frequent if timing is tight. No major issues reported with either recently. If you book a train in advance you have a guaranteed seat; buses you just show up. Both are good options right now — depends whether you prioritize comfort/scenery (train) or flexibility/price (bus).