Can someone explain the pros and cons of each of these? Playing around with converting a Tatula 100 I've got laying around into a BFS reel and I see a lot of people note fixed vs not fixed. Curious about pros/cons etc

Fixed inductor spools are by far the lightest, e.g., Roro-X and AMO.  

These are down to 4 g, and will cast the lightest lures notably farther than anything else out there.  You also need to stick to light lures with them and cast without jerk.  They have no defense against start-up jerk if you cast heavier lures (3/8+ oz) or snap your wrist.  The fixed rotor turns your SV into a full-time linear mag brake (solving mid-cast backlash).  

 

Moving inductor spools such as Ray's Studio are a bit heavier (7 g), totally forgiving, and make up for all the shortcomings of stock Daiwa spools.  They will still cast 1/8 oz beyond your dreams, but not quite in the 1/16-oz league as the Roro and AMO spools described above.  What they add is the ability to fish heavier lures and you don't need to be very particular about your cast.  The moving rotor acts like a centrifugal brake to eliminate start-up overshoot (backlash) from spool jerk.  

 

1 hour ago, bulldog1935 said:

Fixed inductor spools are by far the lightest, e.g., Roro-X and AMO.  

These are down to 4 g, and will cast the lightest lures notably farther than anything else out there.  You also need to stick to light lures with them and cast without jerk.  They have no defense against start-up jerk if you cast heavier lures (3/8+ oz) or snap your wrist.  The fixed rotor turns your SV into a full-time linear mag brake (solving mid-cast backlash).  

 

Moving inductor spools such as Ray's Studio are a bit heavier (7 g), totally forgiving, and make up for all the shortcomings of stock Daiwa spools.  They will still cast 1/8 oz beyond your dreams, but not quite in the 1/16-oz league as the Roro and AMO spools described above.  What they add is the ability to fish heavier lures and you don't need to be very particular about your cast.  The moving rotor acts like a centrifugal brake to eliminate start-up overshoot (backlash) from spool jerk.  

 

So you'd recommend a moving inductor if you were throwing ~1/4oz total weight or so on average?

yes, that will save you a lot of potential start-up backlash with (inadvertent) added snap at beginning or end of your cast stroke.  

Folks seem to like the blue Ray's Studio SV spool on my Zillion - going into 4th year in salt ML niche (1/8 oz) without ever a backlash, and always casts farther than I need.  

 

Dang. Well I can't find any non fixed inductors for my reel ?. They're all fixed. And I ordered 3 different fixed ones.... 

12 hours ago, bulldog1935 said:

yes, that will save you a lot of potential start-up backlash with (inadvertent) added snap at beginning or end of your cast stroke.  

Folks seem to like the blue Ray's Studio SV spool on my Zillion - going into 4th year in salt ML niche (1/8 oz) without ever a backlash, and always casts farther than I need.  

 

As far as finding spools that are compatible, I know this tatula 100 I'm trying to convert is a 34mm spool. Will any 34mm spool work? Or are there other factors at play?

no, it has to be a Tatula spool with longer spindle.  

The only moving rotor Tatula spool I can find on Express website is 32 mm for '20 Tatula.  

Give a fixed rotor a try - if you have a smooth cast, it won't be a problem and will cast your lures into next week.