2x8s or I-joists (TJIs) for my floor framing

My floor joists don&#;t need to hold insulation (unless I add some later for sound insulation) because my crawlspace has insulation outside the stemwall.  

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I could use 2x8s at 16 o.c. and spend $612 on lumber.  Or I-joists 9.5 inches deep, 24 o.c., and spend $894.

-Are I joists kinder to the planet? In terms of trees used it seems like yes, but what about processing footprint?

-Are I joists a lot easier to use?  I know they&#;d be lighter and more uniform than 2x8s.  2x8s can vary a bit in depth, but it seems relatively easy to modify the depth at the joist hanger if necessary so that all match.  More annoying to deal with: twist, bow, cupping, etc.  Might it come down to the quality of lumber I can get?  I can get kiln dried 2x8s.  I know to put all joists crown up.

-cost of hangers seems comparable.  I&#;m hanging the joists from the sill plate using top flanged hangers, which apparently has the advantage of eliminating a rim joist, which is apparently expensive for I-joists.  

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-2x8s give me a little more headroom in the crawl space.  but I&#;d still have about 30 inches even with the I-joists.

-the joists will be ~18 feet long, with a beam to support in the middle.  Plans don&#;t seem to make clear but I assume the beam is under the joists, not at the same height (so not requiring joists to be cut).

-since crawlspace is conditioned, I think plumbing and electrical won&#;t have to be punching through the joists.  (I believe I joists are easier to poke holes in than 2x material.)

Are there other things I should consider?  I look forward to getting some more perspectives.

Thanks everyone!
Paula

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