Hi Nik,
Both companies offer quality products, in fact they may even be the same company, I don't know this for sure; but I had heard they were.
Maybe Justin will chime in and give us the scoop 1st hand.
If you want to go with a higher power, I would also consider the RPL-260 along with the Nova 250 and the Herc. The power level of the RPL model is always understated on our web page as it's best to over deliver on the product, we give the most conservative numbers output power so the customer will always be pleased with what they receive.
First you need to decide how much "portability" you want in your laser. If the size of the laser does not matter, then keep the Herc. on your list. If you want something that is easily carried around in your coat pocket, then the Herc is not for you as it's rather large and not easily toted around.
I don't have any 1st hand experience with Nova or it's product, except that I did own a CNI PGL-3 at one time and the Nova-250 is very much like the PGL-3 and made by CNI I believe.
Our RPL-260 is the smallest and easiest to carry around of the 3, but is only about 1 inch shorter than the Nova 250.
Other considerations:
If you live in Canada, it would be a plus towards the Nova or Herc as there would not be transit through customs or possible customs charges for either the purchase or if it needed return for repair. Another plus if live in Canada would be that buying a Herc or Nova 250 would be supporting a business in your own country and helping your own economy.
If you live in the USA, it would be a plus towards the RPL as there would not be transit through customs or possible customs charges for either the purchase or if it needed return for repair. Another plus if you live in the USA would be that buying an RPL would be supporting a business in your own country and helping your own economy.
Jack