The evolution (ew) range is a step above the XSW in the sennheiser range. If your main concern is range from transmitter to receiver then the higher powered transmitter will definitely allow you to roam a bit further. However, how far would you need in a venue situation, 20m? 30 max? The Ew will definitely be up to it, we use them regularly and have never had issues. I think the xs will probably also do the job for you though, remember these are not cheap mics, the xs is comparable to the shure pgx wireless range. XSW also has remote tuning which is a handy feature.