Right now the rumors sound like:
Sailfish
5" 1080p AMOLED Display
Snapdragon 820 with 4GB RAM
32GB Storage
12 MP camera (8 on the front)
Rear FPS
USB - C
2770 mAh battery
Marlin
5.5" 1440p AMOLED Display
Snapdragon 820 with 4GB RAM
32 or 128 GB Storage
12 MP camera (8 on the front)
Rear FPS
USB - C
3450 mAh battery
Assuming build materials and quality are the same, the real differences are screen, size, battery and whether or not there's a 128GB option. With what we know so far, are you leaning Sailfish or with the larger Marlin?