G'day Jan,
Welcome to Myswag, glad to see you have made it to the forum...... I'm going to say, go the Trackabout!, only because I own one and reckon mine is tops, also I know bugger all about the Armidillos, other than that they looked pretty good when I looked one over at the Cairns Expo....... Both the Armidillo and the Trackabout guys are members on here, maybe one of them will PM you with a deal that is just to hard to knock back

As the for the kitchens in the campers, I'm sure the Armidillo runs a nice unit, and they both run Smev cooktops..... the Drifta's are a top unit though, no nonsense tried and proven, and the slide out drawer holds heaps of gear, with no need to ever lift the bed base......
I'd suggest though if you're going for a walk up/extenda camper, first maybe try and open one up on your own, the overall length of the trailer is obviously longer on the walk up types and therefore the roof support bows are longer also more canvas /weight etc,,,,,,,,
The trailer is longer, which could present some issues on certain trails where a normal 7x4 trailer would get through. The trailer will be heavier which will increase fuel consumption on the tow vehicle...... though yes the walk up is great, compared to a ladder...
Remember, "less is more" when ur on the road and camping it etc,,, do u really need to be putting up/packing up more canvas etc each day when travelling....... however if ur parking up in each place for a while, the extra room might be great.......
Check out the chassis on both too, have a look at what they are made from, the Trackabouts do hot dip gal full chassis in 100mm x 50mm x 3mm, which in my humble opinion is about the best in the business..... also, check out the side wall at the bed, the Armidillos are angled, the Tracky's are vertical.... you'd have to think a vertical wall would offer more room for horizontal folk dancing should the situation present itself...

Catch up with me before u hand over the $$...... we'll have a good yarn Jan.