Hmmm - so same price, same weight, same loading. Yep, FR has a lip, about 3cm tall from the inside. I'd personally prefer it - something to jam things up against. I'm taking my Rhino platform down to Melbourne to the bloke I sold it to - and it fits inside it perfectly! But I'll still use a strap
Front Runner does RTT brackets, which you'd probably know. And it's got a decent network if you need a fix, extra slats or similar. I can also see myself doing something stupid like buying one of their under-rack tables (which is why there are two cut-outs in the side support beams).
I've heard of the Tradesman RR on Prado-Point - there are only good things that people talk about it on there. A couple of comments on rust, but I'm going to guess that happens to anyone - and if you're talking alloy (depending on the alloy) that may be a mute point anyway. That 2400mm is going to sit well forward - as you can see in the photo's the Front Runner really can't go much further back as it'd be up against the tail gate (which I couldn't open fully in the photo as it hits my garage door). From memory its around 2200mm - so another 200mm forward for yours. Could be a good thing - I only put light and bulky stuff up there usually so it's not as if you'd be putting 40kg's forward of the forward-most contact with the roof.
Good luck with the choice though!
Next week I get to put the Bar, Snorkel, Lights, UHF in it (without the lift) and see how it goes. The following weekend will be in the Snowys via Brindabella Ranges so should find out about any 'bump-stop' issues, if they exist.