Tuffpak - accepts your rifles in their soft cases (which you generally need anyhow), relatively light, and if you're still under the weight limit, add shooting sticks, socks, underwear, boots, etc ....
The latches on the Pelican 1750 are useless for airline travel. If you don't mind the case arriving with all the latches undone and the only thing holding the case shut is the pad locks, then go for it.
Maybe the latches on the Pelican stormcases are better. I don't plan to find out because I don't plan on giving Pelican another dime for a gun case.
If the Tuffpak design is not what you're looking for, the latches on Boyt's hard case are considerablly better than the Pelican 1750 latches.
As always, just my opinion, but it is based on personal experience. I have tried the Tuffpak, Boyt and Pelican 1750.