So, I have to know........ (solid vs hyd)

Honestly, with today's very advanced hydraulic lifter designs, you'll probably never feel the difference in 99% of street driven engines. Even the difference between hydraulic and solid roller lifters. The hydraulic lifter has come a very long way since its inception. More precise metering systems allow for much higher RPM capabilities than the once standard "5500". Just about the only place you'll see the difference will be on a dyno or a dragstrip......but you WILL see a difference there.