Always buy the best and in production units. Yes higher priced, but it last longer and you will not risk getting old Apple products from third hand merchants that could have exchange the premium parts for old parts.
Most people go for iPhone 5S now . thinking SE is the same, but priced lower, they got cheated, and some have speaker issues and battery issues, because the merchants replace the parts with bad parts.
f you have never experince an iphone before.
Than you wouldnt know its value.anyway.bigger is always good