It is just a trade-off you have to consider: be able to go faster than opponents or be able to push opponents.
You need to consider strategies like…
- will you need to go fast between cubes and goal zones or can you hold lots of cubes
- will you need to fight for towers
- will you need to fight for cubes
When considering mecanum wheels they have some downsides. If you are interested here is a topic with some good post about this Omni wheel vs Mecanum.
Also some team require motors for other systems and have only a 2 motor base. This doesn’t work with mecanum wheels and is half the power, but the rest of the robot might need it.
H-drive is another option, but it requires more motors. It does have advantages like not being push-able sideways, unlike standard omni-wheel drives, and having smooth and much more lossless motion. It can also be paired with vex differentials.
My team is going with h-drive for now.