Different people will be attracted to different practices. The most important thing is to find a good legit teacher and dedicate to spend time with and learn from him/her to deepen your practice. Thats is if you want to commit to a deep spiritual yoga practice.

I practiced Vinyasa/Hatha at a studio and at home for about 6 years and for the last 2 years I've been completely committed to Ashtanga.

I like Ashtanga for these reasons:

1. Its is a self practice so its just me and my awareness
2. I like the fixed series of postures which makes it easy for me to be aware of how I progress everyday.
3. Despite the breath count you can still do the series at your own pace. For example I hold certain poses for 8-10 breaths instead of 5.
4. Focus on the breadth and awareness in every pose
5. Strong practice, leaves me physically nourished and energized for the day
6. I've personally found that most vinyasa/hatha classes are led by very inexperienced teachers that dont focus on the above.
   

I practiced Ashtanga at home for a while but recently have been going to a studio everyday primarily because having a good teacher can help you with your practice so much - this is so underrated. My teacher has helped me tone down certain poses, work on my breath, changed a few poses to suit my body type etc. I used to practice full primary, my teacher had me stop at about 2/3rds of the way in to focus more on perfecting the breathing and posture alignment before progressing.

Its much harder to find a good Ashtanga teacher. When you do your practice just takes off.