My opinion (and you know what opinions are worth...)
1. Ratcheting tool with interchangeable dies. I do automotive, telco/computer and video with one tool.
2. GOOD terminals with heat-shrinkable insulation. Not cheap, but I've gotten to the point where I use them on EVERYTHING. Extra strength, water and corrosion resistant.
3. "Vampire" splices are an invitation to failure. I won't use them on my worst enemy's equipment. Like most things that are "quick, inexpensive and convenient", they WILL come back to bite you on the butt.