I passed through Crewe station recently and I'm sure it has barriers. If I had to chose between the two I would definitely agree with the suggestion to go to Stafford station instead as it's a much more comfortable station, no barriers, long platforms where you can set up well out of the way of travellers, other enthusiasts so you're not alone, friendly staff and you even get tannoy announcements telling you to stand back when a freight train is coming which gives you time to get ready. Plenty of traffic and a decent amount of freight although it's not light enough yet to catch the busiest time for electric freight which is between 4 and 7pm Nevertheless you'd get half a dozen electric freight at around 11.00, 14.05,14.45, 15.15, 15.55 (2 x 86) and 16.50 if that's what you're after. Otherwise plenty of 66s, Pendos, Voyagers, EMUs and you never know what else on the day and there's no avoiding lines. And if it's cold there's decent waiting rooms on and above the platforms. Hope that helps.
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I must be wrong about the barriers. Cheers.