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A SIPP enables you to invest in a range of options, including direct shares and investment funds rather than just pension funds.
However, it's worth noting that investment funds such as OEICs and Unit Trusts arent as tax efficient as pension funds so generally won't grow as fast as a comparable pension fund - I've attached a graph showing a L&G UK index tracker in an OEIC and a pension fund. Charges get too much attention, especially when we're talking of differences of 0.10% or whatever, and not enough to performance.
Trackers follow all sorts of indices and benchmarks, such as the FTSE 100 and the 250, All Share, etc. A global tracker will generally follow something like the FTSE World (ex. UK) Index or the MCSI World Index.