IMHO, if you're upside down on dirt, mud, sand or concrete, then slider, tipup or throwover canopy doesn't matter... You're going through the Plexi or aluminum to get out.
WARNING! Incorrect design and/or fabrication of aircraft and/or components may result in injury or death. Information presented in this post is based on my own experience - Reader has sole responsibility for determining accuracy or suitability for use.
Harmon Rocket II -SDS EFI
RV-8 - SDS CPI
1940 Taylorcraft BL-65