Because an otter runs ~2300 GBP vs ~1200 GBP for a Seaskin. Suit quality and cut are fantastic. Seaskin also doesn't limit you to their own branded accessories (otter pee valve or conv zip being the only options). I've met 2 people that had issues with their Seaskin. I've met and know a whole lot more that haven't.
I agree that SeaSkin suits are affordable value products. They are a great for backup or dry suit diving that does not involve unintentional contact with cave. However, that's not what
@Black Cat needs, according to the first post:
I need a suit that's durable as the majority of the dives will be in caves and involve some pulling through restrictions.
SeaSkin won't be the best tool here.
SF Tech PRO line is still the king in cave country. You won't find a suit that fits and wears better. However, SF Tech is $4K and up, depending on options. If that is okay, reach out to the US dealer
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The next best option is Otter Atlantic Kevlar - a true made-to-measure suit with reinforcements in high-traction area. You can get the suit for around $2300. Other reinforced suits will hold up well, too, but most aren't true made-to-measure and I'd pass. Streamlined suits generate less drag which is a good thing even in low- or no-flow caves. I've seen a very heavily used Otter Atlantic and was impressed with how it held up to wear.
As for accessories, it is fairly easy to replace a p-valve with what you want. For a cave suit, you probably want standard wrist seals and a neoprene neck seal.
P.S. Another option is to try a few suits to see whether off-the-rack sizing fits you. A friend dives a Santi which is not a true made-to-measure but altered in a few places to fit my friend. As my bud is a standard Large, the Santi fits him perfectly with only a few alternations. However, I'd take SF Tech over Santi for $500 more.