Hello Guyon, and welcome to the Forums.
A plain Delica and a serrated Endura together make a pretty good combination. My feeling is that most of the time a plain edge is better than a serrated edge, and a small blade is usually more convenient than a large blade. Consequently, it makes sense to keep your serrations on the larger knife. Also, serrations lend themselves for a sawing motion, in which case a longer blade is better than a short blade.
Let me tell you why I like the Endura better than any other knife I can think of:
1. It's light. It won't drag your pants down. Not even a swim suit or athletic shorts.
2. It's flat. This is a real advantage when you carry it in your pocket or clipped to your waistband. If you carry your keys or other objects in the same pocket where your Endura is clipped, you can reach past the knife without much interference. The flatness of the handle in conjunction with the width makes the knife carry well in the pocket, without getting twisted around. You know it will be oriented properly when you go to draw.
3. The Endura is very fast to deploy, thanks to the large blade and smooth action. Just grab the knife, jolt it downward to set the blade in motion and add a bit of an upward flip of the wrist to swing the blade up and into the locked position. Using this method, your thumb doesn't have to engage the thumb hole. And it's just as well not to use the hole since, if you're like me, your thumb won't reach it anyway unless you adjust your grip after the initial draw. Try my shake and flip method a few times and you'll see what I mean. I doubt you could deploy a switchblade any faster. Thanks to the clip placement, just enough of the handle protrudes out of your pocket to easily grab hold of, yet the knife rides fairly inconspicuously.
4. The handle is very well thought out. I like the fact that it's wider aft, in comparison to the Benchmade Ascent, for example.
5. The 98 Endura, like the Delica, is totally ambidextrous, as you already know. Construction is similar to the Delica in every respect. It's not the strongest knife you'll run across, but it's strong enough for any sane person to use with confidence.
6. Good blade steel. It'll get really sharp and stay that way for quite a while.
7. The lock release is positioned well: it tends to sit under the concavity formed by the narowest part of my thumb, so there's not much chance of accidentally disengaging the lock--not in normal edge-down cutting, at any rate. Of course your hand may be different than mine.
8. Last but not least, the Endura is economical. You can use it and lose it without too much worry.
There are knives I like better than the Endura in some respects (i.e., brute strength), but it's hard to find a knife that combines so many positive features as the Endura. Take all of the above points and factor in the price and Spyderco's bulletproof reputation for quality and customer satisfaction, and I have to say it may very well be my all-around favorite knife. It's the knife I'm most likely to have with me at any given time, regardless of whatever else I may be carrying. I carry one in my left front pocket every day as a backup for my primary heavy-duty folder. I even sleep with an Endura clipped to my P.J.'s, and swim with one clipped to my swimsuit.
If there was a Nobel Prize for Knives, Sal Glesser would get it for developing the Endura.
David Rock
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AKTI Member # A000846
Stop when you get to bone.