The choice is yours, both powers add their full percentages to regen and recovery, respectively.
On my MA/Regen Scrapper, I initially left Stamina out, but then I respec'd it in. Especially if you plan to solo a lot, can't ever get enough end.
With */Regen it really depends on the toggles you take from the pool powers. For example, taking and using Focused Accuracy(FA) in your 40s as it will put a significant drain on your End that Stamina can compensate for.
If you don't take any End hungry toggles then Stamina can be ignored in a Claws/Regen without any significant impact on combat performance. If necessary this can be supplemented with certain Set IOs that give +Recovery.
Thats great, thanks for the info. I was planning to take them for later on and its nice to see that they have full effects. You've been a great help 
You should probably take a look at Firekitty's guide to regen scrappers here
It is very good guide although a bit exaggerated on the regen uberness praise since it is known that a regen is not really a scrapper, it's the ultimate selfish empath 
-1 point to Steampunk for not suggesting it 
Wasn't necessary as the question was about Stamina and recovery caps, not regen powers.
The exaggeration was deliberate.
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You should probably take a look at Firekitty's guide to regen scrappers here
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And he should take a look at my guide to Claws/Regeneration.
2 very good guides which I found to be very helpful in deciding what to take and how to slot. thank you very much
You're always welcome, enforcer
I have to apologise because I didn't know about your guides Aurrius.
Already saved in Word and ready to get into them.
I took health and stamina, health because an extra 80ish% regen looked good and the fact I would be running focused accuracy, tough, combat jumping and intergration.
It has enabled me to do all this and still attack and not run out of End, as running those without it would have reduced my End quite signifficantly.
Again, depends on what pools and ancillary your taking.
Pssst pssst, you might want to check your signature, unless of course you're a memeber instead of a member 
What? I'm bored and I see things I don't care about when I'm not bored
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I have to apologise because I didn't know about your guides Aurrius.
Already saved in Word and ready to get into them.
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I feel flattered 
Recently started a claws/regen scrapper and am really enjoying it. My question is, should I take fitness pool or is there a cap that makes it redundant with the regen set? I usually take health and stamina on my other toons but I don't want to take them if it is going to be a waste of 2 powers.