depends what you mean by debugging faulty motherboards. if you want to sit on the ISA bus, you need more channels if you want to monitor address + data + latches etc.
most protocols on the 286/486 are not serial busses which is what these "logic analyzers" are really made for. i'd say, if you dont have an oscilloscope + good multi meter, that would be way more beneficial than this.
just kinda of depends what you really want to do with this device.
the 5032 seems expensive for 32 channels imo for these streaming usb LA's but for watching SPI + I2C etc the 1010 would work just fine, just not a lot of that on 286-486 era boards.
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