Both are awesome, so it pretty much depends on what do you want to do with the character.
To ellaborate:
Storm gets better debuffs, Trick arrow gets better hard control. Both have great soft control, even if they are different.
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i would go with storm, have never played TA, but have played both illusion and storm to 50, would have to say it would be my dream combo if i could be arsed to roll another toon.. 
Ill/Storm is great... But do Illusion's Phantoms set off the Oil Slick with fire attacks? If so, I think that could work with TA too...
Something worth considering is that ill/ pets are afraid of the Oil Slick.
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Ill/Storm is great... But do Illusion's Phantoms set off the Oil Slick with fire attacks? If so, I think that could work with TA too...
[/ QUOTE ]Nope, PA just does psi damage IIRC.
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Ill/Storm is great... But do Illusion's Phantoms set off the Oil Slick with fire attacks? If so, I think that could work with TA too...
[/ QUOTE ]Nope, PA just does psi damage IIRC.
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Yup. Even though they use the animations of various attacks with different damagetypes.
Phantasms energy attacks can ignite it though afaik.
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Yup Phantasm's attacks should light an Oil Slick...when he's not busy knocking everything off it 
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My main is an Ill/Storm 'troller at level 38 and there is one thing you should be aware of.
Its very much a "chaos combo" in that you have very few actual "lock down" controls. Most of the time mobs will be slipping and sliding, boucing off walls or staggering like drunks all over the map It will keep ya safe but it will NOT be neat.
Now, unless you REALLY know what you are doing (and I admit I don't) it can be a swine combination to play in teams. Its great if you are in a regular team and can get to know each others powers/styles but in pugs it can be very hard.
I am not saying it's a bad combo, hell I love it and can solo safer than with my Scrapper who is also in his 30s but it's a point I think you need to be aware of.
Illusion/Storm (my first real toon and my only 50)
I've a Grav/TA at 45 too and I'd still go Illusion/Storm.
Messy as hell, but worth it.
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I wanted to make an Ill/Storm but yeah, it can get a bit messy in certain groups. That's why I went Mind/Rad instead, it works well even in the craziest of PUGs and it's makes for some very safe controlling.
Hey guys im gonne make a illusion troler and was wondering whaty ye all think will work the best with it storm semmoning or trick arrow??