I have used a fair amount of both FP4 plus and APX100. IMHO old tech films far better suit street and reportage. Less clinical looking and all things being equal, better mid tone seperation, which is important in an urban envoronment.......lots of Z4-6..... FP4 is finer grained and very good all round. It has a fairly straight upper curve and can be a bit like modern filoms in lacking much of a shoulder. APX is IMHO creamier and has better tonality. It is simply the most beautiful film I have ever used for portraits. It is however grainier and on a thinner base, which can be more prone to buckling on loading onto reels (in 120). Personally I would not go near Tmax, Acros (which I love for other things) for street but cannot comment on Delta 100 as I have not used that much. The modern films are also low on acutance which seriously screws up street images IMHO. TMAX, Acros and Delta are NOT sharp films as some have said! They have great resolution, but esp in the case of Tmax, their acutance is relatively poor and so apparent sharpness lags way behind the traditional films. Sharopness (acutance) and resolution are two very different things........Either FP4 or APX100 would allow either serious sharpness in Pyrocat/Pyro/FX39/Acutol and others or tonality and fine grain in Xtol/perceptol etc etc....or gritty sharp pronounced grain in rodinal/neofin etc. You would make a great succes from any of these. If you for for a Tgrain, don't be surprised when the shots lack easily apparrent bite, gritiness and that moodiness we normally associate with street. Just my opinion......
Tom