I've always used the standard ("Classic") tip. I'm sure a few others came with my (plug-in) Waterpik but after briefly trying them out, I put them away somewhere and now I can't even find them.

Some years ago, when I was concerned with keeping the pressure low rather than high, I even drilled out one of my tips a little oversize (and marked it with tape to identify it). The hygienist expressed "concern" when I mentioned it to her, and that was when she started demanding that I use maximum pressure.

The tips for my "travel" Waterpik don't interchange with the others. I suspect they may deliver higher flow at lower pressure than the other system.

I vaguely remember that the directions for the rubber-padded tip that you use for flushing out gum pockets, said to keep the pressure on the low side. That sounds more like what's called "irrigation" than like blasting off plaque.