IMO the bits are the critical. Whatever unit you get, be sure to use high quality bits. I've had good luck the Jet.
Regardless, you will need to tune them up before using. I recommend diamond honing cones for sharpening. Also, hone and polish the outside surfaces of the chisel using stones.
In a hard wood like pecan you have to go slow to avoid overheating the chisel.
Have you considered a router jig with floating tenons?