i have a multitude of polo1,polo2 and polostar but never seen a polo3,i have heard they are very good-the reason i like hantarex is the ease of repair and the fantastic technical backup.
i have also had equipment with pentranic and found their tech backup pretty good but their digital monitors were a bit of a pain,we ended up changing alot of digital chassis back to analogue,but i must add the analogue chassis were of good quality.
i think this is really gonna come down to a price issue.if you are in the u.k you will get good backup from both.
let us know what you get and how it turns out