Both would be capable of burning wood. 800mw green laser will be very bright a lot brighter than a 1 watt blue laser. A 1 watt blue laser can go as low as 140$ but a real 800mw 532nm laser will be very expensive. If you want a powerful green try out jetlasers. A 1 watt blue laser can be bought of this forum in the by/sell/trade section. You will need goggles for these lasers. If you are buying a laser for star pointing you should get a 30-50mw green laser from lazerer.