I'm not sure whether to use :first or :eq(0) in a selector. I'm pretty sure that they'll always return the same object, but is one speedier than the other?

I'm sure someone here must have benchmarked these selectors before and I'm not really sure the best way to test if one is faster.

Update: here's the bench I ran:

/* start bench */
for (var count = 0; count < 5; count++) {
    var i = 0, limit = 10000;
    var start, end;
    start = new Date();
    for (i = 0; i < limit; i++) {
        var $radeditor = $thisFrame.parents("div.RadEditor.Telerik:eq(0)");
    }
    end = new Date();
    alert("div.RadEditor.Telerik:eq(0) : " + (end-start));
    var start = new Date();
    for (i = 0; i < limit; i++) {
        var $radeditor = $thisFrame.parents("div.RadEditor.Telerik:first");
    }
    end = new Date();
    alert("div.RadEditor.Telerik:first : " + (end-start));
    start = new Date();
    for (i = 0; i < limit; i++) {
        var radeditor = $thisFrame.parents("div.RadEditor.Telerik")[0];
    }
    end = new Date();
    alert("(div.RadEditor.Telerik)[0] : " + (end-start));
    start = new Date();
    for (i = 0; i < limit; i++) {
        var $radeditor = $($thisFrame.parents("div.RadEditor.Telerik")[0]);
    }
    end = new Date();
    alert("$((div.RadEditor.Telerik)[0]) : " + (end-start));
}
/* end bench */

I assumed that the 3rd would be the fastest and the 4th would be the slowest, but here's the results that I came up with:

FF3:    :eq(0)	:first	[0]	$([0])
trial1  5275	4360	4107	3910
trial2  5175	5231	3916	4134
trial3  5317	5589	4670	4350
trial4  5754	4829	3988	4610
trial5  4771	6019	4669	4803
Average 5258.4	5205.6	4270	4361.4

IE6:    :eq(0)	:first	[0]	$([0])
trial1  13796	15733	12202	14014
trial2  14186	13905	12749	11546
trial3  12249	14281	13421	12109
trial4  14984	15015	11718	13421
trial5  16015	13187	11578	10984
Average 14246	14424.2	12333.6	12414.8

I was correct about just returning the first native DOM object being the fastest ([0]), but I can't believe the wrapping that object in the jQuery function was faster that both :first and :eq(0)!

Unless I'm doing it wrong.