Personally it really depends on your play style. It's nice to experiment. I enjoy BLM above all of them. You would need to learn about timing, cast interruptions, and 80% cast trigger a bit. SUM is fun and currently leveling it up to 60. RDM had very little experience looks fun, yet too much jumping around were I see players not timing properly their movements. If you can master the non flashy side movements it may be a fun one to par with BLM.When in doubt, Try them all lol.