Which is best?

I've been watching Carol Klein's gardening series and notice that all of the seeds she sows she covers in a layer of grit. On the other hand,Monty covers his with a layer of compost.
As this is going to be my first year of sowing seeds,which is the best method,grit or compost or does it depend on what you're sowing? 

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I use sieved compost or vermiculate and generally sow undercover but it really depends on what you are sowing.
Monty grows his seedlings for his own gardens and has a very large composting system so for him it makes sense to use compost for seeds which need a bit of depth or no light. He uses grit more for drainage and appearances in alpine pots and troughs.
Can't get horticultural grit here and have never seen vermiculite so I just use compost for the seeds that need covering.
"We don't stop playing because we grow old; we grow old because we stop playing." - George Bernard Shaw
If you're a part-time gardener who is not on hand 24/7 to check on your seedlings then grit but it's an expense so also a question of budget.
"We don't stop playing because we grow old; we grow old because we stop playing." - George Bernard Shaw