Yea volume knob doesn't mean a whole lot (except how loud it will be on that given amp, in that given position, on those given settings, with that given bass
). Personally, I loved the sound of the LH1000 when I played through it, but I liked the sound of the GK 700rb just slightly more and it had a ton more EQ options, so I went with that (My top 2 at the time). So it kind of depends on how much EQ you'll need and which tone you prefer. If the Hartke feels right and you like getting the volume without turning the knob way up then go for it. If you really want to be able to sculpt your sound then go with the Ampeg. Just because the volume knob doesn't get it as loud as quick doesn't mean a whole lot; As long as it still gets as loud as you need it to.