I think the logs would give a much slicker profile and definately easier to install.
BTW,
Unilog; 2400 x 100 = £5.28
You would need 2 Unilogs to get the same width as 1 sleeper, therefore, 2 x Unilogs = £10.56, 1 x sleeper £14.95, so the Unilog is about 30% cheaper. Also, the Unilog...