Tubulars do ride very nicely, but they are expensive and difficult to repair. And a complete tire (or 2) needs to be carried as a spare. Clinchers with light weight inner tubes are very good - and you only need to carry spare inner tubes (and small tools).
Also, 'some current thinking' is that narrow high pressure tires are not as efficient as slightly wider/lower pressure ones - with high pressure the tire has to 'climb up' over small bumps (more effort), lower pressure allows the tire to flex a bit and 'roll over' the bump without having to climb. Also the comfort of slightly lower pressure can reduce the fatigue that can come from harsh ride of higher pressure.
And as mentioned above, DIFFERENT rims are needed for tubulars - DO NOT attempt to use a tubular on a clincher rim.