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What is meant by 'better' varies. Do you mean cheaper? or higher-quality regardless of price?
Or do you mean the best quality for a given price?
In general terms the TASCAM dp-32sd is touted as "TASCAM's biggest PortaStudio yet."
It seems to have lots of capabilities, esp. the many tracks mixable and recordable.
Here are the specifications:
Up to eight tracks can be recorded at a time, is mentioned. You seem to need 10 tracks - all at once? or can you do two of them separately and mix them in?
If you must have 10 at once, simultaneously, this device cannot do that.
I think you could do fine with it. (A glance at the Specs again:
Its frequency range is 20 Hz to 20,000 Hz. That's audio range. Unless you want to record sub-sonic or sub-audible low frequencies, it's good.
Note: if you have an Apple computer, this device *may* have problems with MAC OS X versions past Mountain Lion (10.8).
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Comparing the Fostex with the TASCAM is difficult, like comparing apples to oranges.
The Fostex has both CD-R and hard drive storage. The TASCAM only has memory card storage.
What features do you really require, or want? in the successor to your Fostex.