Out of all blades I've tried so far:
- Astra SP - my golden standard. Comfortable, forgiving, fairly sharp, best on 2nd and 3rd shaves. 1st shave is a little rougher (still very comfortable) and 4th gives me slight irritation. I've been DE shaving for little over 2 weeks now and the past week+ has been irritation free thanks to sticking with them.
- Astra SS - less smooth than SP. Did not work very well for me. Only used one blade x 2 shaves and switched back to SP.
- Personna Blue - feels smooth but I managed to get weepers / small cuts with every shave. Only used one blade x 3 shaves and switched back to Astra. However, that't the blade I will revisit at some point.