Unlike many here, I have both. The ergonomics are better on the t81. The mags are also more robust. Bear in mind it's a 23 year newer design.
The vz58 is a good gun, but not decidedly any better. I would recommend handling both before choosing. In my case, I prefer shooting my t81. Also, not all vz type rifles are created equal. Read up on which models to avoid before choosing. The old restricted vz58s guns from 2005/2006 were the best of breed.
This. You will soon find out about the 858 gremlin and "tabbed" bolts, it is to the 858 platform as the "bent" receiver is to the 81.
It could be argued though that the 858 issues are actually real and have some validity behind them, unlike the 81
And yes, I am part of the club that owns both. I appreciate them both for what they are and how they represent 2 seperate efforts to fill the same perceived need