If I have 0 tolerance, definitely tramadol. With a tolerance, definitely methadone.
I'm a good tramadol metabolizer, so I can get quite pleasantly high from it. But if I have tolerance to the harder stuff (H, Oxy) like I do now, it doesn't do much. The doses I require with my current tolerance have too much side effects to be enjoyable, not to mention the danger of seizures (though that can be somewhat limited with benzos, which are very nice together with tramadol btw).
With zero tolerance; 3-400mg tramadol, a small dose of a decent benzo (basically anything but clonazepam, I really don't like that one) and preferably a spliff (or a few

) will give me a day-long lasting, very pleasant & energetic high with definite opiate effects though they aren't very pronounced at first, it actually feels a little stimmy but never
'edgy' like real stims tend to be. Then after a few hours the high becomes more sedating (I guess it takes a while for it all to metabolize into O-desmethyltramadol?) and sends me into a blissful, sedated & noddy state.
When I have a tolerance, tramadol doesn't really do much. I experience only the side-effects if I try to compensate by dosing higher (nausea, and the
'stimmy' feeling I described above can be a real nuissance when one is in withdrawal and is taking the tram to alleviate the withdrawal). I avoid tramadol when in opiate withdrawal, except for maybe a low dose (200mg max) and only if I have benzos handy.
In the latter case, so with a tolerance, methadone is far better and very much preferable to me. It's unfortunately not very euphoric for me as it is for other bluelighters (most of those people, I've noticed, don't get much out of tramadol, so I'd say we're equally lucky

), but it at least produces opiate-effects when I have a tolerance. Mostly sedative in nature. There's a
little euphoria, but not much. Also, it does have that typical opiatey-
'everything is softer'-feel which in itself makes me a little euphoric (and of course, m'done is quite good at alleviating w/d symptoms when necessary). Much, much better than tramadol or suboxone IME.
I guess you could say I prefer the more stimulating opiates/oids over the sedating ones. I love tramadol, tilidine and even sub (I only like any of the aforementioned w/o any real tolerance, otherwise they're useless recreationally) and oxy (always great

) which are all of a
'sort of' stimulating nature. I reckon I'd like hydrocodone too (it's also rather stimulating AFAIK, no? But that one isn't available in Belgium so IDK for sure and definitely not from experience.)
While I don't particularly love methadone, morphine (at least not orally or rectally, haven't tried IV cuz of fucking gelling pills

), AH-7921 or other opiates/oids that are more sedative in nature. They just don't give me the same level of euphoria that the 'more stimulating' ones
do.
Heroin is a weird one, I love it obviously; and while definitely a mostly sedative opioid, it also has
some stimulating properties at the very beginning IME; a bit reminiscent of those of oxy. It's overall effect is definitely more sedating than oxy though, but in spite of that the euphoria is still very strong with heroin. So the theory that sedating opiates/oids aren't as euphoric as stimulating ones for me, is debunked by H

. Although IMO, H has both stimulating and sedative effects. It's hard to explain, heh. It's a little dose-dependant (high doses are immediately very sedating), but IME at any
'normal sized' dose (very large doses are purely sedative IME) both properties are present, at least for a little while. At first H feels a little more
'stimulating' than sedating, but then not long afterwards, it becomes mostly sedating (which is when things get noddy). The euphoria persists through both
'phases' though. H kind of has it all.
/end coke-fueled post. Hope I kept it coherent.%)