The only advantage of going to court, rather than accepting the fixed penalty, might be that a lower fine could be imposed if you're on a very limited income. The fine would almost certainly be in 'Band C', which means between 125% and 175% of 'relevant weekly income'. (That's your actual income after deduction of tax and National Insurance if you're working, or your JSA/ESA/etc if you're not, but it's subject to a notional minimum of £120).
So if you're on JSA (or similar), the lowest fine you could receive would be one of £150 (= 125% of £120) but you'd still have to pay a surcharge and costs on top of that, so you'd probably not be much better off.
The MINIMUM number of penalty points which can be imposed for the offence is 6, so you couldn't benefit there by taking your case to court.
See pages 147 to 149 here to read exactly what the magistrates would have in front of them when considering sentence:
https://www.sentencingcouncil.org.uk/wp-content/uploads/MCSG-April-2017-FINAL-2.pdf