The value of serp belt is they do just that, or wind all around the motor to catch multiple drive objects using both sides of the belt. If you have nothing to drive then waste of time. You will also play heck trying to find a tensioner mounting point since usually a dedicated boss to put it on.
I do not agree with big amp alts slipping past a point, more like not enough wrap in degrees to get enough friction or belt not tight enough. With serp belt you are limited by the built-in tension of the tensioner, although since I rebuild them I commonly ramp that up a bit over stock. A V belt can be made much tighter since you are in control of the adjustment.
FYI, tensioned serp belts can get into harmonics that play with things depending on the strength of the tensioner spring, some over the counter replacements are junk before you even bolt them on the car. The normal use of them will have the belt jumping wildly and belt choice must be much more exact using them too. I watched people all day long trying to find belts that work on rigged systems say when they want to cut the a/c compressor when it locks up and no money to fix. They do not understand tensioner 'range' at all and commonly pick a belt that is slightly too long or short and a disaster doing that when it affects the tension greatly. Then they either spit belt after belt or the belt slips and they blame belts being the poor retarded souls they were. I watched person after person bring back up to 4-5 broken or 'slipping' belts until they get mad and proclaim our belts were garbage to go elsewhere. What I tried to get them to do after like two, you are only going to lose money dealing with a customer like that who refuses to listen to good sense.
Nowadays it's all about the alternator having a one way clutch in the drive pulley, the selling/training vids show belts that whip around until the alt gets the clutch then suddenly the belt runs so dead smooth, like it has stopped while engine still running. ZERO movement there. They proclaim how much better that is but I have this to say........... ..........bull sh-t. The erratic belt forces are STILL THERE, only now being soaked up by alt pulley/clutch. Now, you go to replace tensioner at $50 say or alt at $200-$250 PLUS the extra tack-on fee of up to $100 for clutch pulley alone and now up to ? in price??? Do the math there, the idea was to increase profits, the alt clutch pulleys fail far faster than tensioners ever could, being smaller and they get hot enough to cook all the grease out. The alt rebuilds beginning to show up when I quit parts were so bad they commonly came back over and over with squealing clutch pulleys in less than a week, it was a huge problem and looked like one that was not going away soon. One guy went through like 4 in a week, Ford OEM the same, they could not make one that wouldn't make pulley noise in a day or two, brand spanking new Mustang. He sold the car over it. BUYER BEWARE!
I'll take the solid alt pulley ANY DAY. OWCs that small belong in like ATX so they can be literally flooded with oil all the time to live.