Bombertech Pindad -
22mm
Velocity style easy to build deck but it's a little small. I comfortably run 2.5mm coils
Easy cotton placement (slots versus holes)
Excellent build quality
Airflow control works terrific
BF pin and squonking works flawlessly
Slotted grub screws are kind of crap, replaced with M2.5X3 allen head grub screws
510 driptip adapter
Single coil adapter
PMA plastic tank with spare (had zero issues with "tank cracking" juice)
Threaded top/driptip is very comfortable and the perfect size
Purchased here for $50:
PinDad Drip Tank by BomberTech
Cthulhu Gaia -
24mm
Large Velocity deck, easily takes 3mm coils
Holes for cotton, not the biggest but no problem
Build quality is excellent as well
Airflow control - works well but if you don't want bottom airflow the side airflow will be off center
Squonking works awesome
Screws are good quality and a standard M3X3
Altum driptip is perfect, not to big or small plus comes with a 510 adapter
Spare glass
No single coil adapter
Gets a little juicy around the side airflow if it is open just like velocity RDA's do
Very tight top cap o-ring that gets broken in pretty quick
Purchased for $28 on Fasttech
Comparing the airflows -
Obviously the Gaia has more options and a wider airflow. The wide open Pindad is just slightly restricted. Both toppers are smooth as silk and I couldn't pick which one has the better flavor. They are both superb in that department.
Bottom line, I love both and glad I bought each of them. Probably the biggest deciding factor between the two is the diameter more so than anything else.
I also have two Split Atty BF RDTA clones, one SMJY and another no name clone from Fasttech. They are a little more challenging to build but very satisfying. The original is sold here for the low price of $159.95!
The Split Atty by DNV
Clones are $10 to $17 on Fasttech:
$16.81 SJMY Split R Atty Styled RDTA Rebuildable Dripping Tank Atomizer - 1.3ml / stainless steel / 22mm diameter at FastTech - Worldwide Free Shipping
Last in my BF RDTA collection is a modified Wismec Theorem, It took some elbow grease to drill through the post under the deck but it works excellent.
Caveat about my Boreas #0001... I was shocked when I received #0001, I am friends with Roxynoodle the designer of the Boreas and Merlin, so I offered to trade with her. I thought it only right that the lady behind the tank should get the very first Boreas off the production line. She refused and told me to enjoy it. A few months later the Merlin came out and I saw someone who had received Merlin #0001 offered just like I did to trade with her. I jumped in and insisted that she take my Boreas as well. In the end she said since I had been vaping on it for a few months she would trade just the bottom cap with me. So I have the body of the Boreas #0001 but the bottom cap now says #0031.
Sorry for being so long winded.