Currently,there are more and more Rebuild-able Tank Atomizer in the market,popular ones like Griffin 25mm, Billow V3 Plus, Merlin RTA and so on. And following is a simple comparison between these three RTA tanks ,hope it will give you some useful information before purchased.

About Griffin 25 RTA

The Griffin 25mm is from GeekVape, with standard and top airflow control versions optional, features 17mm build deck, 6ml or 6.2ml e-juice capacity ,travel-to-the-coil structure for Top Airflow,Available for single or dual coil and so on.

About Billow V3 Plus

The Billow V3 Plus is the latest Rebuild-able Tank Atomizer by EHPRO & Eciggity ,features 5.4ml eJuice , Quad 4mm Diameter Wick Holes,2 Adjustable Bottom Cyclops Airflow Holes and so on.

About Augvape Merlin RTA

The Merlin RTA is available for single or stacked dual coil,features 4mL eJuice capacity,single sided 2 Post Velocity Style Deck ,Juice flow control , Bottom adjustable dual airflow slots and so on.

Griffin 25 RTA vs Billow V3 Plus vs Merlin RTA

Commons

1. rebuildable tank atomizer
2. 510 threading
3. PEEK insulator
4. wide bore drip tip
5. easy to setup and use

Different

1. came from different team.
2. eJuice Capacity : Griffin 25mm is 6.2/6mL eJuice optional, the Billow V3 Plus RTA is 5.4mL,the Merlin was 4mL.
3. Size : Griffin 25 RTA and Billow V3 Plus is 25mm,the Merlin RTA is 23mm.
4. Airflow control : Billow V3 Plus 25mm and Merlin RTA with Bottom Airflow Holes ,the GeekVape Griffin 25 RTA with Clicking-Clock Positions airflow control.
5. Griffin 25mm RTA and Merlin RTA is for single and double coil.
6. Merlin is cheaper than Griffin 25 RTA and billow v3 plus RTA 25mm.

So,IMO, the Billow V3 Plus by EHPRO & Eciggity is the best 25mm RTA tank in the market, while the Griffin 25 RTA is the most popular Rebuildable tank atomizer, the Augvape Merlin RTA is a appealling tank and now it is very popular .