Tube rental just ensures that you have a tube available tonuse for the visit.
When I got our session passes tube rental for the year was only $20. So on busy days we don't have to wait.
Only on the busiest days you should consider. You have to carry tubes up the slides so if super busy, you have to give it up once ride is over. If not super busy, no need to rent. I never waited more than 2 mins for a tube so a rental isnt really needed.
They have a limited supply at the lazy river. If you want one for the wave pool or to not have to wait for one at the lazy river then a tube rental is your best bet. My son's prefer to not use one, but other people love them!
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