A lot of the positive feedback about Vanguard is US-based and whilst perfectly valid, they're ultimately passive funds and are therefore easily replicated in other non-Vanguard products. Zurich, for example, offer "Indexed Global Equity (BlackRock)" which is a very similar product. Ultimately, you just need to look for the words "passive" or "indexed" and make sure the expense ratio is cheap (ideally should be in and around 0.1%- 0.2%).
After that, you're choosing between vendors (i.e. the Zurich's or Standard Life's) based on their relative AMC's, which are higher and therefore more impactful than the fund expense ratios. These can be 0.75% to 1.5% or so. Finally, make sure to compare allocation also - ideally 100% or more.