Sliding I prefer in tighter spaces so you don't have the door in your way. Swinging could give you easier access for spot cleaning etc though.
As for synthetic versus glass, the synthetics can scratch much easier and look like crap over time but while glass doesn't scratch easily and cleans up well it can pose its' own hazards if it breaks.
Ultimately, the choice is yours and you know better what your needs and priorities are.
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