Honestly, I don't really think you need a whole lot of power for simply jazz, nor is there any brand that really beats the other. Of course, more headroom gets a nicer sound and gives more versatility (so, you could use it on a rock gig if need be), but I have loved the years of service my used Polytone Mini Brute III gave me for the $200 I paid for it. I still use it when I don't care to break down my other rig. Sounds great with upright and electric, and has decent volume...though doesn't keep up if you're playing with a guitarist with a full stack. But it has done incredibly well for everything from a small duo to a large jazz orchestra, both indoors and out.