Ball locks will have a relief valve on the lid whereas pinlocks, many times, do not. I just started kegging as well and I use pinlocks because I find them to be a little cheaper. I have no experience using balllocks but I find pinlocks to be adequate for dispensing and secondary. If I need to relieve pressure I use the end of a screwdriver to press down on the stem, there are adapters available for that purpose but you don't need them.
A fine beer may be judged with just one sip, but it's better to be completely sure. -- Czech proverb