I use red,yellow and tan 90% of the time. Large grey or blues as needed. Small blues oranges or blacks for florescent luminares are used often. I pretwist all my splices. Pigtailing is a local code requirement. Rarely have had a splice fail because I test them before the a tucked into the box. It may not be the fastest way to do this but I have secure splices. I only use tape if the splice will be in a wet or high possibility of condensation area.
