Our favorite after testing many different options is the carborundum coated glass plate and the combination of a Flexplate system + Buildup type sheet. If your model has enough stiffness it allows you to release the part by flexing the plate nearly most of the time. If adhesion is too strong, we recommend heating the build plate (90C) to allow the material to crystallize, crystallization helps the release of the printed part from the platform.
The carborundum coated glass plate tends to release easily after printing, but hold the part firmly in place using a brim. After printing heat-up the platform (90C) to allow the material to crystallize, crystallization helps the release of the printed part from the platform.
If you want to print on a regular glass plate or other smooth rigid plate, then we recommend the following.
For bigger parts which tend to warp more, use 3DLac to keep the part secured to the plate during printing. After printing heat-up the platform (90C) to allow the material to crystallize, crystallization helps the release of the printed part from the platform.
For smaller prints you can try printing with out 3DLac, of course still use a brim to keep the part secure during printing.