Re: tac tailor or london bridge ruck
I'm with Chunky - I ran the Malice 3 for most of this decade and it held up very well. It's still old school ruck requiring an ALICE frame, which is why I went with it, but it has so many advantages over the ALICE rucks we were issued in the 80s and 90s. The material it's made out of is the same ultra-sturdy material used to make the issue duffel bags. The storm flap, claymore pouch and sleeping bag pouch along with the expanded external pouches make it a capable of carrying almost too much. Add to it the extra thick padded shoulder straps and kidney pad and you're in business.
The Eagle packs I was issued in the past were pretty small and the only GP ruck I used from them was still fairly small compared to what the MALICE could hold. That said, if it has the features you're looking for and holds enough cubic volume, then go for it. The number one thing Eagle has over TT in my opinion is better quality stitching - though you pay for it.
Personally, when it comes to rucks, I prefer Kifaru over all others (the only problem is not many of them are jump certified).