It's always a hard decision and nothing comes for free..
What I mean by that is if you want fuel economy you sacrafice power, if you want power you sacrafice economy. I have a landcriser and a hyundai getz ,I think they are both great cars but they are good and bad in different areas.
I think your delima is much the same , both trailers have very good points about them and to me these good points are in different areas ,as well as they both have bad points ,agian in different areas.
So it will come down to what you want and what your intended use is as it will make one stand out over the other.
When we bought our Safari we were very close to buying the lifestyle as I liked the front toolbox and poleholder set up , but I preferred the trackabout 10ft tent , I liked the kitchen on the lifestyle but not the trailer construction . So as you can see it really is a matter of finding out whats more important to you.
Niether of them are the holy grail I don't belive any C/T is even my current KK has it's shortfalls .
So best of luck and really sort through the pros and cons of both and place a number from 1 to 10 next to them for the pro,s and then a negitive 1 to 10 for the negitive points and then youll get a clear winner.. on paper at least.
I have owned 2 trackabouts and never had an issue with either of them and the resale of both was excellent and was quick.
Kind regards
Jetcrew