I assume the frame on the 24 inch style is longer to accommodate the larger wheels?
Not necessarily. Also beware some 24″ bikes are pretty terrible for messing about on. The Sunday Model C being one of the exceptions to this.
Also, as you’re coming off an XL Nicolai G13 I can’t begin to imagine how small a BMX is going to feel 😯
What is the difference between a 200 quid bike and a 500 quid bike in the bmx world? All I want to do is practice manuals, hop up kerbs etc.
Quality of materials generally in the frame, forks, bars, cranks, hubs etc. more expensive = stronger and lighter.
https://www.winstanleysbmx.com/product/81190/Haro_Annex_Pro_XL_Race_2017_BMX_Bike
or this albeit the tyres would need changing!
https://www.winstanleysbmx.com/product/81184/Haro_Downtown_24inch_2017_BMX_Bike
Well you’ve picked picked 2 pretty different bikes there. One is an aluminium race BMX with 20″ wheels, the other is a steel (cheap hi-ten steel at that) freestyle BMX with 24″ wheels. The race BMX will be quicker to accelerate but probably less easy to manual as race BMX’s generally are setup to be stable with low BB’s and long chainstays. The steel one looks okay for messing about but it’s going to weigh a ton being made of hi-ten everywhere.
I’d avoid both of them TBH.