Choosing Between Mindfulness and Compassion Meditation

Basically, I have tried for some time mindfulness meditation. I have also tried compassion meditation. In mindfulness meditation, my mind becomes very still, with few thoughts, but outside of meditation the mind remains so. My thoughts outside of meditation are quite abstract, but I am perhaps stunted emotionally and in terms of visual images. I don't feel my mind wanders too much though. In compassion meditation, I visualize loving-kindness and compassionate images, and I usually end up crying or feeling positive affect in my body. It is nevertheless quite difficult for me to visualize vividly. **How does one decide which type of meditation to engage in? Would both mindfulness (focused attention) and compassion generate some type of meditative concentration?**