depends on how much work you want to do, how big you want to go in brakes and what wheels you want to go

As stated at the start, R31 brakes go straight onto blurbird struts, but they have a rather small disc size to wheel size ratio....ooo fancy term.... meaning that to run the r31 250mm ish disc means needing to run 14s. compared to stanza 256mm discs that you can fit 13s over

bluebird struts should probably also be trimmed down for shorteer inserts if you are going to have a low ride height.
as bluebird struts use the same brakes as r31 struts, you have some easy bolt on brake upgrades, see DATSPORT r32/33 comversion. think you can get a 15 inch wheel over their 28mm disc setup, and 16s over the 296mm setup. they are some pretty big brakes, can come with a price tag to suit

but then being that stanza shares the same brakes as 200b and 240k there are also large bolt on conversions for them, see MADDAT rx7 conversion. think you can get 15s over their 276mm disc setup. not exactly awesome wheel fitment though

Then if you want to do like i did, make everything yourself, i got r32 calipers and r33 discs(296mm) and fitted them to stanza struts so they fitted under 15s. and costs were significantly reduced, but alot more time involved

but like i said, wheel fitment and brake size need to be known before one can be said that it is better than the other.
quick bolt on decent brakes for wheels bigger than 14s, bluebird is the go. but havent seen much/anything decent that will allow a smaller wheel than that