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Can't go wrong with anything Fi build, love the Team AA but its out of your range here
Why not just call them, see what they recommend as best for your needs? find out first how much enclosure space you can spare though and what your goals are

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I just brought the team v2's, and so far they are great. I'm still doing tuning and doing some adjustments. If you have proper enclosure space your going to get loud if you want lowz get the sp4.

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Zv5

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Fi makes good product. If you're in a hurry, shop elsewhere, they are known for slow build times.

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i have a btl neo 12,it sound realy good and more punchy than the m'y Q

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the Q neo is the next step up for the older Q. its going to have that good tonal sound with more power handling. if you loved the Q look no further. its going to be louder than the SP4 and team until you get into the 4kw region. a solid 2500 will and it will POUND..
if you want alot of output and have less than 3kw get the BLv3

if you want to compete get the BTL neo

if you can get your hands of a solid 4kw or more a want a street beat woofer the SP4 is beast.

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From a topology stand point or from a performance standpoint?

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The Z5 uses whats called a long gap long coil(lglc) design and longer winding length coils whit larger top-plate they also using shorting rings in the motors to stabilize parameter shifts and increase thermal power compression. They also use spaced spiders to decrease rocking on the coil and a very deep cone profile.. the result is a very linear and stable excursion profile with increased low frequency extension and output. These woofer will work nicely in a variety of enclosures and naturally have a smoother more laid back tonality. they aren't your typical high output woofers that sound punchy or overdampend they are excellent sounding woofers that LOVE THE LOWS..
The FI Q is obviously built around a very strong motor using a thinner top-plate. I wouldn't say its a LCSG(long coil short gap) but the B/L profile is different and its has the advantage to use a shorter coil for a given stroke lower moving mass and increasing sensitivity but increases inductance. it too has good cooling but lack the shorting ring and the high efficiency that you would get around 30hz like the z but it will have a stronger up frequency output and the tonality will be abit more aggressive.

All in all its about what you want. if you want something thats super loud down low and sound excellent the Z5 is a MONSTER. if you want something a tad more balanced and more efficent above 45-70hz the FI Q is a EXCELLENT option. nether one will sound bad. you can make the FI bottom heavy and the SD super punchy. they are both versatile but naturally like i said they have a slightly different build and are slightly better in certain areas. there is no way on earth to say one is better than the other they are both tremendous designs and id be happy to own either one.

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