Wikes looks far too coarse for seedlings. Maybe that's why they've had to put in extra/more abrasive fertilizer to counteract it. Don't think I'd buy either, I'm not rich but I've learnt to buy the best i can find or it all becomes a waste of time and money. :(
I like Westlands, and Levingtons usually deliver what it says [or doesn't say ] on the bag... ::)