I find the full body binder is good for tucking in stomach and even flattening hips a bit, although I do feel the compression there a good bit
I used to wear a half / tank top binder, which was more comfortable but made my stomach appear bigger and made me a bit more disproportionate.
Best to see what works for you, I am gonna say though DO NOT go for cheap binders, most are non breathable, especially the ones labelled 'lesbian' , 'tomboy' and 'cosplay' . These will damage your ribs, stop you from breathing properly and mess up your chest.
Breathable binders are great, bandages or 'cosplay' binders are bad. Bit more money for good ones and frustrating if you're finding which one works for you, but worth it for your health.
I recommend a full length underworks binder, tuck it in good fitting pants and you're fine
Good luck
~ Matty