Currently I (personally) prefer Cura.
However, Simplify3D is nice and has a good control panel for the machine. I guess it has much potential to become even better.
Slicing is super-fast.
The last update has improved the quality of the prints quite a bit.
Regarding trial versions:
I believe you can ask for such. These people are very kind to help with any requests.
For me this sw is a gain for the K8200, allthough there is (or was at the time) no pre-defined config for the K8200 (might come in the future).
Added direct USB support for XYZprinting Da Vinci printers
Added direct USB support for MakerBot 5th Generation printers
Improved slicing to avoid gaps between thin walls
Added option to specify infill extrusion width for stronger interior structures
Added the ability to choose which extruder is used for the raft, skirt, and brim
Added the ability to create dense support layers at the surface of the part, saving time and material
Added option to use larger extrusion widths on the first layer for better adhesion
Improved optimizations for perimeter printing order
Improved interaction of rafts, skirts, and support structures for multi-process builds
Added the ability to set a larger tool change retraction that can help prevent oozing with multiple extruders
Added option for mm/s speed display units
Added the ability to modify the top and bottom outer solid layer speed to improve surface finish
Added build statistics for part weight
Added options to change the grid spacing on the build table to a distance of your choosing
Added option to hide coordinate axes
Improved support for a wider range of OBJ file formats
Bridging extrusion multiplier can now be greater than 100% for thin layer height prints
All G0 commands have been replaced with G1 for better cross compatibility
Added preconfigured profiles for XYZprinting Da Vinci 1.0/2.0, MakerBot Replicator Mini/5th Gen/Z18, FlashForge Dreamer, re:3D Gigabot, PowerSpec 3D X/Pro, and IonCore Zinter Pro