Both are really good as they come out of the box so depends on what his actual intentions are!
I'd say if he is planning on racing then the B4 RTR is probably the best base of the two as it's much more able to deal directly with motor upgrades etc. in the future with no upgrades to the car. 2wd will also teach him car control faster than a 4wd.
The ZX5 RTR is a cracking car though and you won't get a 4WD on track cheaper! If your planning on racing with modified motors then you will need to upgrade the driveshafts sooner or later. If he is going for a ZX5-RTR pay the extra few quid and get the brushless version, will be cheaper in the long run!
There are plenty of ZX5-RTRs racing at club level though, especially indoor clubs.
At the end of the day you pays your money and takes your choice, won't regret either.
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