They are of similar initial design
BUT the Big Stick is RIGID ,as it is PVC encased, and will stand on it's own.
The PVC also weather protects the antenna and gives it better protection for a more permanent antenna installation. PLUS loses little portability due to the small size , though the wire only version is much the same as the one in the link.
BIG PLUS...You make this one yourself..
AND you can make the WIRE ONLY version of the big stick,though dimensions change due to the fact that the PVC actually RADIATES RF (few know that PVC is somewhat conductive to RF) The measurements for wire only are in my poorly written instructions.
The big stick is a model of a zep antenna, it is a half wave over a quarter wave matching stub and though it has GAIN...that is not much of an issue with VHF/UHF antennas where HEIGHT above terrain is your primary limiting factor.
I don't sell, I freely give these plans away . If you want to get quality and satisfaction , BUILD ONE.
For a GO BAG ,the roll-up version is OK,but will not survive the stress of daily use for long..What are you going to GO in that a 5 to 6 foot piece of PVC will not fit in,or on,also?If you are going to where communications is NEEDED...I think it better to take something substantial enough to RELY ON.
I get upset when HAMS ,who are held high because they have technical ability,want to purchase such simple to make items...forgive me as this was not a personal attack. But aren't WE ,as HAMs and survivalists...more about SKILL and standing tall on our own feet??