I think that both landy & frontera have their respected good and bad points. guess our opinion is just "slightly biased" as we own one (or 3). The landy forums are the same in that repect.
best points of the frontera would be it's underbody protection, and the cheapness and ease to do a body lift.
best points for landy, parts and resale value
now these are points that I have selectively "borrowed" from FOG and green oval forums. and therefore may not be a true reflection of both automobiles
My dad owns a series 1 landy that's done way over 250,000 miles, in that time it's had the half-shafts replaced a few times, the gearbox / diffs reconditioned or replaced once but apart from that never let him down.
having only owned a frontera I couldn't make an honest opinion about them both, but she does me well and she's fairly easy to work on...just really the availabilty of parts at times.