I have both in head format. The Cali Tweed 40 has a bit more bounce and give, it's a bit sweeter in the mids and it has more "airy," sparkly, presence-y highs that can make a guitar sound almost acoustic with the right settings. The Lonestar Classic sounds bigger and has deeper lows that extend farther down the spectrum, but it is a slightly "harder" sounding and feeling amp in the mids and highs, and it doesn't have the Presence extension the Cali Tweed has, even with the Presence knob maxed out, but the Lonestar Classic has a character of its own that makes it magic in its own unique way.
Both amps are incredible at what they do and I'd be happy with either one by itself, but blending the two and even applying a crossover to get the lows / low mids of the Lonestar, and the highs / high mids of the Cali Tweed is pretty much ideal.
I still haven't played a Fillmore 100. I'd love to try one. I know that amp has a slightly higher presence extension than the Lonestar Classic, and I wonder if it actaully would sound like a Cali Tweed blended with a Lonestar.