I was also trying to decide on what was best for me, and we are all after one thing--the best sound we can afford. Luckily , size was not a concern as I have a vehicle to schlep my stuff to and fro the gig. Size shmize....its about the sound really. And the price...
I wanted to be flexible so I bought a small mixer and a powered speaker. I have a Mackie 6 channel mixer and Yorkville NX55P. I did get two speakers, but used only one until I could afford the second, and it worked out great. Adding a sub,I can also use this with my trio in medium rooms.
My opinion is that the combo style guitar amps for acoustic guitar sounded like a compromise,which they are , IMO. They are about convenience/budget more than performance. I did not try the Schertler's but they are supposed to rock mightily. I like having more sound than I need, and this rig was just over a grand(one speaker is around 850 Cdn). The mixer was just over 200.
I hate to sound like a schnob but I dont want to hear someone playing AND singing thru a low end sounding rig. If it does not sound low end, then great.
So....
One Yorkville NX 55 -P + Mackie DFX 12 = $1100
None of the combo's were even close to getting the vocals where I can get them with this rig( I use a Beta mic).Adding the 2nd speaker was an expen$e, but once I knew I was going to work regularly, no worries. Sounds better than the Mackie powered mixers, IMO. PLUS--the Yorkville customer support is good here in Ontario.