If u buy from Klook, you don't need to Q up at Odakyu (which can be very long) to buy the pass.
You just need to go to their counter to collect the pass by showing Klook's e- voucher.
No picking up of voucher is required.
Klook will email you the e- voucher.
Klook selling at exactly the same price as Odakyu counter but you pay Klook SGD (so no foreign exchange fees) whereas at Odakyo you are paying in Yen.
I’ve never experienced much of a Queue at the Odakyu office frankly, and you can buy from the vending machines even. And foreign exchange fees are really minimal all things considered. Given rate fluctuations you may be paying a ‘less’ at the counter itself if the rates change in your favour.